Blog
Practical insights on building MVPs, choosing the right tech stack, and turning ideas into production-ready apps.
On-Device Document AI with MediaPipe + VLMs
Combining MediaPipe's LLM Inference task with a quantized PaliGemma or moondream2 model to parse document layouts (receipts, forms, invoices) on-device — coveri
Ship on-device AI with Apple Foundation Models + SwiftUI
Deep dive into Apple's new on-device Foundation Models framework (iOS 18.4+), covering the FoundationModels session API, prompt guard behavior, memory tier dete
PgBouncer vs pgpool-II vs Supavisor for mobile APIs
Deep dive into connection pooler selection and tuning for backends serving mobile apps — burst traffic from app launches, sleep/wake cycles, and push-notificati
CameraX + TFLite depth maps under 35ms on Android
Depth map generation from monocular camera frames using a quantized MiDaS or Depth Anything v2 model, covering YUV-to-float tensor conversion in CameraX's Image
ExecuTorch + Compose: Streaming LLaMA 3.2 on Android
Deep dive into ExecuTorch's ET-format model loading, XNNPACK delegate configuration for ARM CPUs, token-by-token emission via Kotlin StateFlow, and the memory m
Wiring Android's MediaPipe Image Embedding API to a Vector Store for Real-Time On-Device Visual Search: FAISS, Product Quantization, and the Memory Budget That Fits in 500MB
How to build a fully offline visual similarity search pipeline on Android using MediaPipe's ImageEmbedder, FAISS with PQ compression, and a custom ANN index tha
MediaPipe LLM Android: On-Device Inference Without UI Jank
Deep dive into MediaPipe's LlmInferenceSession — async token streaming via Kotlin StateFlow, proper coroutine scope binding to Compose lifecycle, GPU delegate v
On-device speech transcription on Android under 200ms
End-to-end pipeline from raw PCM capture via AudioRecord, chunk segmentation with voice activity detection, GGML int8-quantized Whisper inference via JNI, and r
PostgreSQL partitioning for mobile time-series backends
Deep dive into declarative table partitioning for mobile backends storing event logs, analytics, and telemetry — covering partition pruning mechanics, how forei
CameraX to VLM: Real-Time Captions Under 50ms on Android
End-to-end pipeline from CameraX ImageAnalysis to a quantized CLIP/PaliGemma-style VLM encoder — covering YUV-to-RGB conversion without GC pressure, NNAPI deleg
PostgreSQL planner stats: why queries break at scale
Deep dive into pg_statistic, n_distinct estimates, correlation coefficients, and how stale planner statistics cause index scans to flip to seq scans under real
CameraX + TFLite vision encoder under 40ms
Connecting CameraX's ImageAnalysis use case to a quantized CLIP-style vision encoder via TensorFlow Lite, covering YUV-to-RGB conversion without allocation spik
Kotlin Flow Backpressure: Buffer vs Conflate on Android
Deep dive into how Flow's backpressure operators behave when producers outpace consumers — covering buffer overflow strategies, conflation trade-offs, and the l
Real-time CoreML in SwiftUI with Swift 6
Deep dive into CoreML's MLPredictionOptions and batch inference scheduling on Apple Neural Engine — covering how to pipeline image classification requests throu
KMP Flow to Swift 6 AsyncStream without data races
How to wire KMP's Flow-based async patterns through expect/actual declarations into Swift 6's strict concurrency model — covering MainActor boundaries, the @Obj
Android NNAPI + Gemma 3: batched embedding deep dive
Deep dive into using NNAPI delegates for embedding workloads rather than generative inference — covering INT8 vs INT4 quantization impact on embedding quality,
PostgreSQL index bloat: fix B-Tree fragmentation in mobile backends
Deep dive into how btree indexes degrade under insert-heavy workloads (user events, telemetry, session data from mobile apps), why pg_stat_user_indexes lies to
Streaming Core ML LLM tokens to SwiftUI with actors
How to build a real streaming token pipeline from a Core ML compiled LLM through a Swift 6 actor, back-pressured with AsyncStream, rendered in SwiftUI without m
Gemma 3n on Android: Sub-2GB multimodal inference
ExecuTorch's XNNPACK and NNAPI delegates for deploying Google's Gemma 3n multimodal model on Android — covering the model export pipeline, quantization for sub-
Wiring Ollama to Android: local LLM without the cloud
How to point Android's OkHttp client at a local Ollama instance, handle streaming token responses with SSE, manage connection lifecycle across network changes,
PostgreSQL Row-Level Security Without the Performance Tax
Deep dive into how RLS policies interact with the PostgreSQL query planner — covering policy inlining, why naive RLS destroys index usage, how to write policies
Speculative decoding on mobile: 2-3x faster LLM inference
How speculative decoding with a small draft model (e.g., a 1B model drafting for a 7B verifier) reduces mean token latency by 2-3x on mobile hardware — covering
PostgreSQL partial & expression indexes: skip the ORM
Deep dive into how partial indexes (WHERE clauses) and expression indexes (functional indexes) interact with query planner statistics, covering real patterns li
On-device KV-cache prefix scheduling for ANE & NNAPI
How to implement a prefix-aware request scheduler that detects shared prompt prefixes across concurrent inference sessions, routes them to reuse cached KV block
Zero-downtime schema migrations with Postgres replication
Using logical replication slots to run old and new schema versions simultaneously, draining in-flight writes, and executing atomic cutovers — covering slot lag
MLX Swift: Run Fine-Tuned LLMs Without the CoreML Tax
Direct MLX Swift bindings bypass CoreML's model compilation and ANE scheduling latency — covers MLX array operations, model loading from Hugging Face Hub via sw
PostgreSQL Index-Only Scans: Why Your Covering Indexes May Be Lying to You
Deep dive into how index-only scans interact with the visibility map, why autovacuum frequency directly determines whether your covering indexes actually work,
Android CameraX + TFLite GPU: real-time vision pipeline
End-to-end CameraX ImageAnalysis → TFLite GPU delegate inference pipeline with concrete latency budgets, buffer lifecycle management, and the YUV-to-RGB convers
PostgreSQL vacuum internals: fixing write-pattern bloat
Deep dive into how autovacuum's cost-delay and scale-factor defaults fail under mobile backend write patterns (frequent upserts, event streams, session tables),
MediaPipe Graph API + TFLite: Custom On-Device Pipelines
Most coverage stops at MediaPipe's high-level Task API. This digs into the graph-level API: building custom CalculatorGraphs in C++ with JNI bridges, wiring TFL
PostgreSQL WAL tuning for high-throughput mobile backends
Deep dive into WAL configuration parameters that most developers treat as black boxes — covering how checkpoint pressure manifests as latency spikes in mobile A
Viral loops for developer tools: engineering PLG mechanics that compound
Technical implementation of in-product viral loops — shareable outputs, team invite triggers, usage-based sharing hooks, and the activation funnel instrumentati
Metering pipelines for usage billing: idempotency, skew, and Stripe sync
How to architect a real-time usage metering system — event ingestion, idempotent aggregation, stripe billing sync, and the edge cases (clock skew, duplicate eve
LLM tool calls + WorkManager on Android
How to wire multi-step LLM tool-call loops into WorkManager's chained requests with retry policies, progress reporting via LiveData, and constraint-based schedu
PostgreSQL connection pooling: PgBouncer vs pgpool-II vs managed pools
Transaction-mode vs session-mode pooling semantics, prepared statement incompatibilities, SET LOCAL leakage, and the per-tenant connection accounting patterns t
SQLite WAL2: Ending write starvation in Android apps
Deep dive into SQLite's WAL2 mode (available via custom SQLite builds and SQLiteDatabase extensions), how it eliminates the write starvation problem in high-thr
Flash attention on ANE: fast long-context prefill
Practical implementation of tiled attention computation on Apple Neural Engine using CoreML's new stateful attention primitives, with concrete benchmarks showin
Vision + Core ML: Zero-copy inference in Swift 6 actors
How to build a zero-copy inference pipeline from AVCaptureSession through Vision's VNImageRequestHandler into a Core ML model, using CVPixelBuffer pools to elim
CDC without Debezium: Postgres WAL to Kafka in Go
Parsing the Write-Ahead Log with pg_recvlogical and pgoutput, building a lightweight CDC connector in Go/Kotlin that publishes row-level change events to Kafka
TFLite Delegates on Android: GPU, NNAPI, Fallback Chains
Deep dive into TFLite delegate selection strategy — GPU delegate thread safety pitfalls, NNAPI compatibility matrix across API levels, fallback chains when hard
WebAssembly on the edge: Ktor & FastAPI in WASM
Compiling JVM and Python backend handlers to WASM via GraalVM Native Image and Wasmtime, eliminating container cold-start overhead in serverless edge deployment
WebSocket vs HTTP/2 streams for mobile APIs: 50k connections
How to use HTTP/2's multiplexed streams to deliver real-time push events to mobile clients without the per-connection overhead of raw WebSockets — covering stre
KV-cache eviction: serving LLMs on Android without OOM
How production mobile LLM runtimes handle concurrent inference requests using continuous batching strategies, paged attention-inspired KV-cache management, and
On-Device LLM in Compose: MediaPipe, StateFlow, ViewModel
Deep dive into Google's MediaPipe LLM Inference API as a higher-level alternative to raw llama.cpp/NNAPI — covering the session lifecycle, how to stream tokens
Compose Multiplatform interop: bridging native views without the jank
Deep dive into UIKitView/AndroidView interop boundaries in Compose Multiplatform — covering render tree reconciliation, input event forwarding, focus management
JSON schemas from on-device LLMs: constrained decoding
How to wire grammar-based constrained decoding (GBNF/EBNF grammars in llama.cpp, MLX-LM) to enforce valid JSON output from quantized on-device models — covering
Adaptive API payloads for mobile under network pressure
How to build a backend response pipeline that detects client network conditions via request metadata, then progressively degrades JSON payload fidelity—dropping
KV-cache poisoning: securing multi-tenant LLM APIs
How semantic caches and shared KV-cache pools create cross-tenant data leakage vectors in multi-tenant LLM API deployments — covering cache key namespacing, ten
Quantization-aware fine-tuning for on-device LLMs in 2025
Deep technical walkthrough of QAT vs PTQ tradeoffs, calibration dataset construction, GGUF quantization formats (Q4_K_M vs Q5_K_S vs IQ4_XS), and the mobile inf
During conversion, mark KV buffers as stateful
Core ML stateful models (introduced in iOS 18) allow you to persist key-value cache tensors across inference calls — eliminating the O(n²) prefill cost on every
PostgreSQL BRIN indexes: 128-page vs 50GB B-tree
Deep dive into Block Range INdexes (BRIN) for append-heavy telemetry tables — covering correlation requirements, operator class selection, minmax-multi for spar
PostgreSQL multitenancy: schema vs partition at scale
Comparing partition pruning vs schema separation vs separate databases for SaaS tenant isolation, with query planner behavior, migration strategies, and the pg_
Speculative decoding on Android: 2–3x token throughput
Implementing speculative decoding with a small draft model (e.g., Qwen 0.5B) paired with a larger target model in llama.cpp on Android — covering the draft/veri
Developer Content Marketing: 50k Monthly Readers Blueprint
The exact content architecture — topic clustering, SEO keyword mapping for technical searches, internal linking graphs, and the editorial pipeline — that turns
PLG activation funnels for developer tools: an engineering guide
Engineering the PLG motion from the inside out — how to instrument activation milestones, build viral loops into the product itself (team invites, shared worksp
PostgreSQL logical replication: zero-downtime migrations
Deep dive into pg_logical replication slots, subscriber lag monitoring, DDL replication gaps, and the specific migration choreography (dual-write → logical repl
eBPF + OpenTelemetry: Cut trace costs 90% on Kubernetes
Using eBPF-derived trace spans alongside OTEL collector pipelines to implement tail-sampling and dynamic alert suppression — so you pay for signal, not noise, a
Kubernetes ML sidecars with MIG partitioning: 40–60% inference cost reduction
Practical DevOps pattern for co-locating inference services with application containers using Kubernetes device plugins, MIG partitioning on A100s, and Triton I
Whisper.cpp on Android: sub-100ms on-device ASR
Direct JNI bridge between AudioRecord's PCM buffers and whisper.cpp's streaming encoder, eliminating the round-trip through WAV files, with GGML's Android GPU b
Zero-copy LLM inference: NNAPI + llama.cpp on Android
Deep dive into how llama.cpp's Android backend can use NNAPI delegate via TFLite shim, with focus on AHardwareBuffer shared memory between CPU/GPU/DSP, avoiding
Swift 6 On-Device Inference: MLX GPU vs. Core ML ANE
How to structure concurrent Swift 6 actors around MLX's GPU compute and Core ML's ANE scheduler so inference requests never block the main actor, with concrete
Ktor + OpenTelemetry: Distributed tracing for microservices without the observability tax
Wiring OpenTelemetry SDK into Ktor with custom span propagation, coroutine context carriers, and a Grafana Tempo backend that gives you end-to-end request traci
PostgreSQL partial indexes: kill seq scans on 100M+ row tables
Deep dive into partial indexes for tenant-scoped queries, how PostgreSQL's predicate locking interacts with partial index scans in REPEATABLE READ isolation, an
eBPF for mobile API observability: zero-touch tracing
Using eBPF TC hooks and XDP programs on the backend to capture mobile API traffic at the socket level, correlate with Android OkHttp trace IDs, and build flame
GraphQL APQ: Cut mobile API latency with edge caching
Implementing APQ (Automatic Persisted Queries) with a CDN-aware hash registry, showing how to shift from dynamic query strings to SHA-256 content-addressed requ
eBPF observability: zero-code latency tracing in K8s
Using eBPF programs attached to kernel tracepoints to capture inter-service latency, TCP retransmits, and syscall profiles inside Docker/Kubernetes pods without
Chunked Prefill: Hitting Sub-300ms TTFT on Android
Chunked prefill splits long prompts into fixed-size token blocks processed across multiple frames, interleaving decode steps to prevent UI jank while waiting fo
Mobile API Gateway Patterns That Cut Backend Load in Half
Implementing a mobile-optimized API gateway layer with request deduplication, adaptive circuit breaking (half-open state tuning), and stale-while-revalidate edg
CoreML ANE + Swift Concurrency: Block-free inference
Deep dive into how the Apple Neural Engine scheduler interacts with Swift 6's structured concurrency model — specifically, how to correctly dispatch CoreML pred
Token budget optimization: reduce LLM API costs by 60–75%
Practical techniques for reducing LLM API spend without sacrificing output quality — covering tiktoken-based budget analysis, prompt compression with LLMLingua,
Dynamic LoRA adapter loading for on-device LLMs on Android
How to load LoRA delta weights at runtime on top of a quantized base model using llama.cpp's adapter API, manage per-task adapter caches in memory-constrained e
On-device LLM scheduling: priority queues on Android
Designing a runtime scheduler that multiplexes on-device LLM inference across concurrent callers — background summarization, foreground chat, and inline suggest
CoreML model compression: cut on-device latency by 50%
Walk through Apple's coremltools palettization and unstructured pruning APIs, compare INT4 vs INT8 weight quantization tradeoffs on Neural Engine vs GPU executi
KMP subscription architecture: one engine, two platforms
Building a truly shared subscription engine in Kotlin Multiplatform — abstracting RevenueCat/StoreKit/Google Play Billing behind expect/actual interfaces, serve
WebSockets over HTTP/2: the mobile real-time performance fix
How HTTP/2's stream multiplexing breaks standard WebSocket upgrade semantics, why most mobile apps unknowingly fall back to HTTP/1.1 for WebSockets, and the con
gRPC bidirectional streaming: mobile backpressure done right
Deep dive into flow control windows, cancellation propagation, and the OkHttp/gRPC-Kotlin coroutine bridge that prevents your streaming endpoint from overwhelmi
PostgreSQL index-only scans: the hidden VACUUM dependency
How index-only scans interact with the visibility map, why VACUUM frequency directly determines whether your covering indexes actually avoid heap fetches, and t
Continuous batching for on-device LLM inference on Android
Implementing continuous batching (iteration-level scheduling) in a local llama.cpp Android server — covering dynamic batch assembly, per-sequence KV cache slot
Flash Attention on Android: tiled SGEMM with RenderScript
How to implement a memory-efficient attention mechanism on Android using RenderScript intrinsics and tiled SGEMM, reducing peak HBM usage during LLM prefill by
PgBouncer transaction mode for 50k mobile users
Transaction-mode pooling breaks named prepared statements and advisory locks — most tutorials skip this. Cover the exact PgBouncer configuration (pool_mode, max
Android LLM speed: KV cache persistence cuts latency 60%
Persistent KV cache serialization to disk between app sessions using llama.cpp's state save/restore API, combined with a prompt fingerprinting strategy that det
gRPC-Web on mobile without a proxy: Connect Protocol
Benchmarking Connect-Kotlin and Connect-Swift against OkHttp REST and URLSession, covering protobuf code generation in Gradle/Xcode, bidirectional streaming ove
Zero-downtime PostgreSQL schema migrations: WAL & locks
Deep dive into how PostgreSQL's WAL and MVCC interact during DDL operations — why naive ALTER TABLE acquires ACCESS EXCLUSIVE locks that queue all reads, how pg
ARM NEON SIMD Intrinsics for Mobile Text Embedding: Building a Sub-10ms Semantic Search Pipeline That Runs Entirely On-Device
Deep dive into using ARM NEON vectorized dot-product and quantized int8 matrix multiplication to accelerate small embedding models (like E5-small or GTE-tiny) o
Speculative Decoding on Mobile GPUs: Running Draft-Verify LLM Pipelines on Android with Vulkan Compute and Dynamic Batch Scheduling
Implement speculative decoding — where a tiny draft model proposes tokens and a larger verify model accepts/rejects them in parallel — entirely on-device using
CRDTs for Offline-First Mobile Sync: Automerge in Kotlin Multiplatform, Vector Clocks on Constrained Devices, and the Conflict-Free Data Layer That Eliminates Your Backend Sync Service
Practical implementation of CRDT primitives (LWW-Register, G-Counter, RGA) in KMP shared code with actual Automerge-kt integration, comparing sync strategies (s
Quantized LoRA Adapters for On-Device LLMs: Hot-Swapping Task-Specific Behaviors on Android Without Reloading the Base Model
Deep dive into QLoRA adapter architecture on mobile: loading 4-bit quantized base models once into memory, then dynamically swapping 2MB LoRA adapter weights fo
PostgreSQL Advisory Locks for Distributed Job Scheduling: Replacing Redis and SQS with Native Database Primitives That Scale to 10K Jobs/Minute
Deep dive into pg_try_advisory_xact_lock for leader election and job claiming in multi-instance deployments, covering lock granularity strategies (transactional
Redis Streams: the event bus that delays Kafka by 2 years
Deep dive into Redis Streams' consumer group semantics (XREADGROUP, XACK, pending entry list), implementing exactly-once processing with idempotency keys in Kto
KV cache quantization: Llama 3.2 3B in 2 GB on Android
Deep dive into KV cache memory management for on-device LLM inference on Android — covering per-layer INT4/INT8 mixed quantization of key-value caches, grouped-
Profile-Guided Optimization for Android App Startup: Baseline Profiles, Cloud Profiles, and the Dex Layout Pipeline That Cut Our Cold Start From 1.2s to 380ms
Deep dive into how ART's ahead-of-time compilation interacts with Baseline Profiles and cloud-aggregated profiles, covering the DEX layout reordering pipeline,
Apple Foundation Models SDK with Claude Code: Building Hybrid On-Device/Cloud AI Pipelines for iOS Apps in Swift
Deep dive into Apple's just-announced Foundation Models framework (from WWDC/the new SDK docs trending on HN today), showing how to architect a tiered inference
PostgreSQL generated columns: cut P99 latency 80%
Deep dive into using PostgreSQL's STORED generated columns combined with GIN expression indexes on JSONB tenant configuration data to push computation from quer
Replacing Your Kubernetes Cluster with a Single SQLite-Backed Binary: The Litestream Replication Architecture That Runs Your SaaS on a $5 VPS
Deep dive into embedding SQLite with Litestream continuous replication as a production backend for early-stage SaaS: WAL-mode tuning for concurrent reads, S3-st
Structured output grammars for on-device LLMs on Android
Deep dive into GBNF (GGML BNF) grammars for constrained decoding in llama.cpp on Android — how grammar-guided sampling restricts the token logits at each step t
Deterministic replay testing for Kafka microservices
Build a deterministic replay testing framework that captures production Kafka topic snapshots with header metadata, replays them against new consumer versions w
Fixing Android jank you can't see with Systrace
Deep-dive into using Perfetto/Systrace to identify non-obvious jank sources in Jetpack Compose apps — specifically RenderThread GPU completion fences, recomposi
Memory-mapped I/O for Android SQLite: Eliminating read latency spikes
Deep dive into SQLite's memory-mapped I/O mode (PRAGMA mmap_size), how it interacts with WAL mode on Android, the specific page cache behavior differences betwe
Rust-Based N-API Modules for React Native's New Architecture: Replacing JSI C++ Bridges with Memory-Safe Native Code That Cuts Crash Rates and Simplifies Cross-Platform Builds
Walk through building a high-performance native module using Rust compiled to N-API for React Native's Bridgeless mode, covering the FFI boundary design, zero-c
.github/workflows/binary-check.yml
Data-driven ASO analysis examining the underexplored relationship between submission frequency, binary size deltas, and App Store/Play Store algorithm signals —
HTTP/2 stream multiplexing pitfalls in mobile APIs
Deep dive into why most mobile apps get worse performance from HTTP/2 than HTTP/1.1 due to misconfigured connection coalescing, TCP-level HoL blocking on lossy
Adaptive Bitrate Log Streaming in CI/CD: Chunked Transfer Encoding, Server-Sent Events, and the Backpressure Architecture That Makes 10GB Build Logs Browsable in Real Time
Deep dive into the infrastructure behind real-time CI/CD log streaming — how to architect a system that handles massive build output without OOM-killing your lo
Taming Compose Multiplatform Image Decoding on iOS: Skia Codec Pitfalls, NSImage Bridging, and the Memory Pipeline That Stopped Our OOM Crashes
Deep dive into how Compose Multiplatform's Skia-based image decoding on iOS bypasses platform-native caching (NSCache, ImageIO progressive decoding), leading to
PostgreSQL Partial Replication with Logical Decoding: Streaming Only What Your Microservices Need Without Change Data Capture Tooling
Using PostgreSQL's built-in logical replication slots with row filters and publication column lists (PG15+) to selectively replicate domain-specific table subse
Structured Concurrency in Ktor 3 with Kotlin Coroutines: Supervising Request Pipelines, Scoped Background Jobs, and the Failure Isolation Architecture That Prevents One Slow Upstream from Cascading Across Your Entire Service
Deep dive into how Ktor 3's structured concurrency model interacts with coroutine supervision trees during real request handling — covering how to scope paralle
Gradle Build Cache Poisoning in CI: Content Hash Collisions, Remote Cache Integrity, and the Verification Pipeline That Caught Our Silent Miscompilations
Deep dive into how Gradle's remote build cache can serve stale or corrupted outputs in multi-module Android/KMP projects — covering content hash verification, c
Systematic ANR Diagnosis in Jetpack Compose Apps: StrictMode Gaps, Perfetto Trace Correlation, and the Lock Contention Patterns That Hide Behind Main-Safe Coroutines
Deep dive into how Dispatchers.Main.immediate plus synchronized Room DAO callbacks create invisible main-thread blocking that StrictMode misses, using Perfetto'
Vulkan compute kernels for Android LLM inference
Writing custom Vulkan compute shaders—tiled matmul, flash-attention-style fused softmax, and memory-mapped weight loading—that bypass NNAPI/TFLite delegate over
eBPF-Based APM for Kotlin Backend Services: Zero-Instrumentation Latency Profiling, Continuous CPU Flame Graphs, and the Observability Pipeline That Replaces Your OpenTelemetry Agent
Using eBPF (via tools like Pyroscope, Grafana Beyla, or custom BPF programs) to profile Kotlin/JVM backend services without adding SDK dependencies or code chan
Incremental Annotation Processing in KSP2: Custom Gradle Plugin Isolation, Multi-Round Symbol Resolution, and the Build Architecture That Makes 500-Module KMP Projects Compile in Under 90 Seconds
Deep dive into KSP2's incremental processing model — how dirty-set propagation across multi-round annotation processing actually works, the classpath isolation
Compile-Time Memory Layout Optimization for On-Device ML Models: How ART Profile-Guided Allocation and Object Pinning Cut GC Pauses During Inference by 90%
Deep dive into Android Runtime memory management during ML inference — using profile-guided compilation hints, large object space pinning, and region-based allo
Connection Pool Exhaustion in Spring Boot Under Kotlin Coroutines: R2DBC vs HikariCP, Dispatcher Starvation, and the Reactive Pipeline That Handles 10x Traffic Spikes Without Dropping Connections
Deep dive into the mismatch between Kotlin coroutine-based backends and traditional JDBC connection pools — how coroutine suspension semantics cause hidden pool
Mobile WebSocket tuning that stops silent message loss
Deep dive into the often-misunderstood interaction between WebSocket ping/pong frames, TCP keep-alive timers, and mobile OS network state transitions (doze mode
Install
Deep dive into Xcode's llbuild dependency graph, how explicit module builds change compilation parallelism, and the specific build settings (SWIFT_ENABLE_EXPLIC
Ktor Connection Pooling with Coroutine-Per-Request: HikariCP Tuning, Connection Leak Detection, and the Dispatcher Architecture That Handles 50K RPM on a Single $20 VPS
Deep dive into how Ktor's coroutine model interacts with JDBC connection pools — why naively using Dispatchers.IO with HikariCP causes thread starvation under l
Speculative Decoding for On-Device LLMs on Android: Draft-Verify Pipelines, KV Cache Sharing, and the Architecture That Doubles Token Throughput Without Increasing Memory
Deep dive into implementing speculative decoding on mobile: using a tiny draft model (60M params) to propose candidate tokens verified by a larger target model
Backpressure-Aware SSE Reconnection in Mobile Clients: EventSource Gaps, Exponential Backoff with Jitter, and the Kotlin Flow Architecture That Prevents Message Loss During Network Transitions
Deep dive into the often-ignored client side of Server-Sent Events on mobile: how standard EventSource implementations silently drop messages during reconnectio
Zero-Copy Deserialization in Kotlin/Native for KMP Networking: flatbuffers, Cap'n Proto, and the Parsing Architecture That Cut Our API Response Processing from 12ms to 0.3ms
Deep dive into zero-copy deserialization techniques for Kotlin Multiplatform networking layers — comparing FlatBuffers and Cap'n Proto against JSON/Protobuf, sh
PostgreSQL Advisory Locks for Distributed Job Scheduling: Skip Locked, Lock Timeout Tuning, and the Coordination Pattern That Replaces Your Message Queue
Deep dive into PostgreSQL's pg_advisory_lock and pg_try_advisory_lock combined with SKIP LOCKED queues for building distributed job schedulers without external
Quantized Vision Transformers on Android: Running Florence-2 with ONNX Runtime Mobile for Real-Time Image Understanding Under 500MB RAM
Walk through the full pipeline of deploying Microsoft's Florence-2 vision-language model on Android: ONNX export with dynamic axes, INT8 post-training quantizat
Android Baseline Profiles: the CI pipeline that cut cold start by 35%
Deep dive into generating and validating Baseline Profiles using Macrobenchmark library with custom startup journeys, leveraging Cloud Profile delivery via Goog
Server-Driven UI for Mobile Apps: JSON Schema Contracts, Component Registries, and the Backend Architecture That Ships UI Changes Without App Store Review
Deep dive into implementing a server-driven UI system from scratch: defining a versioned JSON schema contract for declarative UI components, building a typed co
CRDTs for mobile sync: Automerge vs Yjs vs cr-sqlite
Compare practical CRDT implementations (Automerge, Yjs, cr-sqlite) for mobile use cases: model common app data structures as CRDTs, walk through how causal orde
PostgreSQL LISTEN/NOTIFY for Real-Time Features Without Adding Infrastructure: Connection Management, Payload Limits, and the Pub/Sub Architecture That Replaces Your Redis Dependency for Small-Scale Event Systems
Deep dive into PostgreSQL's built-in LISTEN/NOTIFY as a lightweight pub/sub mechanism for startups that don't yet need Redis or Kafka. Cover connection pooling
Step 1: Run with tracing to capture loaded classes
Deep dive into JVM cold start problem for Kotlin serverless functions, comparing AWS SnapStart's firecracker snapshot approach vs CRaC (Coordinated Restore at C
Kubernetes Pod Scheduling for GPU-Accelerated ML Inference: Topology-Aware Placement, Device Plugin Fractional Sharing, and the Affinity Rules That Cut Our P99 Latency by 40%
Deep dive into scheduling ML inference workloads on heterogeneous GPU clusters using Kubernetes 1.36 device plugin API v1beta1, topology manager policies (singl
Diagnosing Android Jank with FrameTimeline API: Surfaceflinger Deadlines, HWUI Thread Contention, and the Systrace Workflow That Pinpoints Exact Recomposition Frames Dropping Below 16ms
Deep dive into Android 12+ FrameTimeline API for production jank diagnosis — connecting Choreographer frame callbacks, HWUI render thread scheduling, and Surfac
Gemini Nano On-Device Function Calling for Android: Structured Output, Token Budget Constraints, and the Architecture That Makes Offline AI Agents Practical
Deep dive into Google's newly expanded Gemini Nano on-device capabilities announced at I/O 2026, specifically the function calling and structured JSON output fe
App Store Keyword Cannibalization: How Your Own Apps Compete Against Each Other and the Metadata Architecture That Fixes It
Deep dive into how multi-app publishers unknowingly split keyword authority across their own portfolio, covering subtitle vs keyword field weighting, locale-spe
Profiling Jetpack Compose Recomposition in Production: Composition Tracing, Stability Annotations, and the Metrics Pipeline That Found Our Hidden 60fps Drops
Deep dive into using Compose Compiler metrics and runtime composition tracing to detect unstable classes causing excessive recompositions, building a lightweigh
Building a Usage-Based Billing Pipeline: Metering Events, Idempotent Aggregation, and the Stripe Meter API Architecture That Handles Millions of Events Without Losing a Cent
Event ingestion with exactly-once semantics using idempotency keys, time-window aggregation with late-arrival handling, Stripe's new Meter and Billing Meter Eve
Redis Beyond Caching: Sorted Sets for Leaderboards, Streams for Event Sourcing, and the Lua Scripting Patterns That Replace Three Microservices With One Redis Instance
Deep dive into Redis as a primary data structure server rather than just a cache layer — covering sorted set ranking with O(log N) updates, Redis Streams as a l
SQLite Partial Indexes and Expression Indexes in Mobile Apps: The Query Optimization Techniques That Cut Our Room Database Read Times by 80%
Deep dive into SQLite's underused partial indexes (CREATE INDEX ... WHERE) and expression indexes for common Room/mobile patterns — filtering by is_synced, crea
Subscription Recovery Architecture for iOS and Android: Grace Periods, Billing Retry, and the Server-Side Webhook Pipeline That Recovers 15% of Involuntary Churn
Deep technical walkthrough of implementing server-side subscription lifecycle handling across StoreKit 2 and Google Play Billing 7 — processing DID_FAIL_TO_RENE
ARM NEON SIMD for real-time audio on Android NDK
Deep dive into using ARM NEON SIMD instructions via Android NDK for real-time audio DSP — covering lock-free ring buffer design for the audio thread, vectorized
Kotlin Coroutine Structured Concurrency Pitfalls in Production: SupervisorScope, Exception Propagation, and the Cancellation Architecture That Prevents Silent Data Loss
Deep dive into how structured concurrency actually behaves in production Kotlin backends and Android apps — covering the subtle differences between coroutineSco
Adaptive Bitrate Model Loading on Android: Dynamic GGUF Shard Selection Based on Runtime Memory Pressure and Thermal State
Build an adaptive model loader that monitors ActivityManager.getMemoryInfo(), thermal callbacks via PowerManager, and GPU memory headroom to dynamically select
gRPC Bidirectional Streaming in Mobile Apps: Connection Resumption, Deadline Propagation, and the Flow Control Architecture That Handles Unreliable Networks
Practical implementation of gRPC bidirectional streaming on Android (grpc-kotlin with coroutine Flows) and iOS (grpc-swift with AsyncSequence), covering mobile-
eBPF observability that replaced our $4K/month APM
Walk through building a practical eBPF-based observability pipeline for a startup's Kubernetes cluster — covering BPF CO-RE for portable probes, per-pod HTTP la
Gradle Build Cache Deep Dive: Content-Addressable Storage, Remote Cache Invalidation, and the Configuration That Cut Our KMP CI Times by 65%
Walk through how Gradle's build cache actually works internally — content hashing, relocatability requirements, and the specific cache poisoning scenarios that
KV Cache Quantization for On-Device LLM Inference on Android: INT4 Attention States, Sliding Window Eviction, and the Memory Architecture That Fits a 7B Model in 4GB RAM
Deep dive into KV cache memory management for on-device LLM inference — covering how quantizing key-value attention caches from FP16 to INT4 with group-wise sca
Streaming LLM Tokens to 10K Concurrent Users: Backpressure, Coroutine Channels, and the SSE Fan-Out Architecture That Scales Without Melting Your Server
Engineering deep-dive into scaling server-sent event streams for LLM token-by-token delivery — coroutine-per-connection with structured concurrency, bounded cha
Eliminating Android ANRs in Production: Strict Mode Traps, Binder Transaction Limits, and the Background Thread Architecture That Dropped Our ANR Rate From 2.1% to 0.08%
Deep dive into the three most common ANR root causes in production Android apps — accidental main-thread disk I/O triggered by SharedPreferences.apply() during
PostgreSQL Connection Pooling Under Pressure: PgBouncer Transaction Mode, Prepared Statement Workarounds, and the Pool Sizing Formula That Actually Works for Multi-Tenant SaaS
Deep dive into the real-world pain points of PostgreSQL connection pooling — why transaction-mode PgBouncer breaks prepared statements (and the DEALLOCATE ALL /
SDK: google-generativeai (pip install google-generativeai)
Practical guide to integrating voice input and voice output in chatbots using Gemini APIs. Two different approaches: standard API for pre-recorded audio transcr
What Happens in the 400ms Between Your API Call and the LLM Response
Deep dive into the full infrastructure journey of an LLM API call: API gateway, load balancer, tokenization, model router, prefill/decode inference, post-proces
Claude Code Slash Commands That Actually Save You Hours
Practical guide to the most useful Claude Code slash commands and shortcuts. Not a full list of 93 but the ones that matter most for daily dev workflow: context
Kotlin lazy {} Has 3 Modes and You're Probably Using the Wrong One
Deep dive into LazyThreadSafetyMode in Kotlin: SYNCHRONIZED vs PUBLICATION vs NONE. When to use which, performance implications, and why blindly using the defau
Agentic gatekeeping: how AI controls what you buy
How InPost, Amazon, Alibaba and Xiaohongshu use AI ranking algorithms to control purchase intent. The mechanism behind semantic filtering in e-commerce: who ran
The Perfectionism Trap: When Your Developer Brain Fights Your Founder Brain
How engineer-turned-founders struggle with perfectionism, shipping before ready, and the painful shift from code quality to business perspective. Practical advi
Kotlin Name-Based Destructuring: The Silent Bug Fix Most Devs Missed
Kotlin 2.3.20 introduces name-based destructuring (experimental). For years, data class destructuring was position-based, causing silent bugs when property orde
Zero downtime schema migrations in distributed DBs
How distributed databases (CockroachDB, YugabyteDB, TiDB, Spanner) handle schema changes vs single-node PostgreSQL. Cover online DDL, schema versioning, and mig
Expand-Contract Pattern vs Blue-Green Deployment for PostgreSQL Schema Migrations
Compare two major strategies for zero-downtime schema changes. Expand-contract: add new column, migrate data, drop old. Blue-green: run two schemas in parallel,
Zero Downtime Database Migrations: A Practical Guide for PostgreSQL
Step-by-step guide to performing schema migrations in PostgreSQL without any downtime. Cover ALTER TABLE tricks, CREATE INDEX CONCURRENTLY, adding columns with
Investing in Top Companies and ETFs: A Developer's Practical Guide to Building a Portfolio
Practical investing workshop for tech professionals — how to identify market leaders, evaluate ETFs, build a diversified portfolio covering stocks, commodities,
Stop using OFFSET for pagination — it won't scale
Deep dive into why LIMIT+OFFSET degrades linearly with dataset size, and how keyset (cursor) pagination solves it. Cover the scan-and-discard cost, index seek v
CLAUDE.md best practices: 8 patterns that work
Practical guide to CLAUDE.md, skills, hooks, local context files, and progressive disclosure — how to structure your repo so Claude Code actually understands yo
Google Rejected My Developer Account So I Filed a Legal Complaint and Won — They Paid 250 EUR
Step-by-step guide on using ADR (Alternative Dispute Resolution) to appeal Google Play developer account rejection. Real experience: filed complaint, took one m
.github/workflows/migrate.yml
Head-to-head comparison of expand/contract pattern and blue-green deployment for PostgreSQL schema migrations. Cover advisory locks, ghost tables, CREATE INDEX
Distributed tracing on a budget with OpenTelemetry and Grafana
Walk through setting up a complete observability pipeline for a startup's backend using OpenTelemetry Collector with tail-based sampling policies, Tempo for tra
Replacing Your Message Queue with PostgreSQL: SKIP LOCKED Queues, LISTEN/NOTIFY Pub/Sub, and the Transactional Outbox Pattern That Eliminates Dual-Write Bugs Without Adding Infrastructure
Deep dive into PostgreSQL-native patterns that replace Redis/RabbitMQ for startups under scale: FOR UPDATE SKIP LOCKED as a job queue, LISTEN/NOTIFY for real-ti
nvidia-device-plugin ConfigMap
Deep dive into running mixed-priority LLM inference workloads on shared GPU nodes using Kubernetes device plugins, NVIDIA MPS for time-slicing, and a custom pri
Record thermal + sched + freq data for 60 seconds
Deep dive into how Android's thermal management framework (thermal HAL, cooling devices, trip points) actively sabotages long-running on-device LLM inference, w
Speculative Decoding on Android: Running Draft-and-Verify LLM Inference On-Device with Dual GGUF Models and the Token Acceptance Pipeline That Doubles Generation Speed
Implementing speculative decoding on-device using a small draft model (0.5B) paired with a larger target model (8B), covering the parallel verification algorith
WebGPU Compute Shaders for On-Device LLM Inference in Android WebViews: The GPU Pipeline That Bypasses NNAPI Limitations
Using WebGPU compute shaders via Android WebView to run quantized LLM matrix multiplications on mobile GPUs, bypassing NNAPI's operator coverage gaps and vendor
Idempotent API Design for Mobile Payment Flows: Request Fingerprinting, Server-Side Deduplication Windows, and the Exactly-Once Architecture That Prevents Double Charges on Flaky Networks
Deep dive into implementing idempotency keys with server-side deduplication using PostgreSQL upserts and TTL-based cleanup, client-side retry strategies with Ok
Kotlin/Native GC tuning that cut P99 latency by 60%
Deep dive into Kotlin/Native's modern memory manager internals — how the tracing GC with cycle collection actually works under the hood, practical mimalloc allo
Server-driven paywall A/B testing that moves revenue
Build a server-driven paywall system where offer presentation, discount tiers, and exit-intent triggers are controlled remotely without app updates. Cover the f
Predictive Prefetching in Android with TensorFlow Lite: Training Navigation Models on User Session Data and the On-Device Inference Pipeline That Cut Our P95 Screen Load Time by 40%
Building a lightweight sequential prediction model trained on anonymized navigation logs, converting to TFLite with dynamic quantization, running inference in a
Gradle build cache deep dive: how we cut 70% of redundant KMP compilation
Walk through how Gradle's build cache actually works at the hash level — task input fingerprinting, path sensitivity, relocatability pitfalls with KMP expect/ac
Zero-downtime schema migrations in production PostgreSQL
Deep dive into how tools like pg_osc and pgroll perform online schema changes — using advisory locks to coordinate migration workers, shadow/ghost table copy-an
.github/workflows/api-compat.yml
Deep dive into practical API versioning strategies beyond the usual REST basics — comparing URL-path versioning, custom header negotiation (Accept-Versioned), a
Container image caching in GitHub Actions: 12 min to 90 sec
Deep dive into Docker BuildKit's cache mount feature, registry-backed cache layers with --cache-to/--cache-from, and multi-stage build patterns specifically opt
How to calculate true startup CAC with organic traffic
Break down the difference between blended CAC and paid CAC, show how misattributing organic signups to paid channels inflates your unit economics, walk through
Streaming LLM responses to mobile: SSE vs WebSockets
Deep dive into the end-to-end plumbing of streaming token-by-token LLM output from a Ktor backend to a Jetpack Compose UI — covering SSE vs WebSocket tradeoffs
.github/workflows/ai-review.yml
Practical setup of a locally-hosted agentic coding loop using the new Qwen3.6-35B-A3B mixture-of-experts model — covering quantization choices (GGUF Q4_K_M vs Q
Modularizing Your Android Build with Convention Plugins and Version Catalogs: The Gradle Architecture That Cuts CI Time in Half
Deep dive into Gradle convention plugins using buildSrc vs build-logic composite builds, TOML version catalogs with bundle declarations, and the dependency grap
Keyword cannibalization in ASO: a data-driven fix
Deep technical dive into how App Store and Play Store search algorithms handle keyword weighting across title, subtitle, keyword field, and description — with a
Cohort retention curves: the PMF signal in your data
Move beyond vanity metrics with concrete PostgreSQL cohort analysis queries, specific retention benchmarks by app category (Day 1/7/30), the flattening-curve si
Building an LLM gateway that cuts your AI bill by 70%
A technical deep-dive into building a self-hosted LLM proxy layer that sits between your mobile/web clients and model providers — covering model routing and aut
Validating Your Startup Idea with a Landing Page, Waitlist, and Stripe Test Mode in One Weekend
A step-by-step technical walkthrough of wiring up a Next.js landing page with Posthog analytics, a Resend-powered waitlist, and Stripe test-mode checkout to mea
Spot node pool configuration
Deep dive into replacing GitHub-hosted runners with self-hosted runners on AWS/GCP spot instances orchestrated by actions-runner-controller, covering graceful j
SQLite on the server: the single-node architecture handling 100K req/s
SQLite on the server as a PostgreSQL replacement for indie and startup workloads — covering Litestream for continuous S3 replication, WAL mode tuning on ext4/bt
Fine-Tuning Whisper.cpp for On-Device Speech-to-Text in KMP: Quantization Strategies, Audio Preprocessing Pipelines, and the Streaming Architecture That Delivers Real-Time Transcription Without Cloud Costs
Deep technical walkthrough of integrating Whisper.cpp into a Kotlin Multiplatform project using expect/actual declarations for platform-specific audio capture (
Running Vision-Language Models On-Device in Android
Technical deep-dive into running VLMs (LLaVA/MobileVLM-class) on Android — covering the dual-model architecture (CLIP vision encoder + language decoder), INT4/I
Android Baseline Profiles and Macrobenchmark in 2026: Measuring Real Startup Time Improvements Across Dex Layouts, Cloud Profiles, and the ART Compilation Pipeline
Deep dive into how Baseline Profiles actually work under the hood — AOT compilation via cloud profiles vs on-device profile-guided optimization, how dex layout
Structured output from on-device LLMs on Android with GBNF
Move beyond raw text generation to building agentic features with on-device models — covering GBNF grammars for structured JSON output via llama.cpp, function-c
Change data capture replaces polling for mobile sync
Building a CDC-powered sync pipeline using PostgreSQL logical replication slots and Debezium to push granular data changes to mobile clients. Covers WAL decodin
On-Device RAG for Android: Running Embedding Models, Vector Search in SQLite, and the Retrieval Architecture That Keeps Sensitive Data Off the Wire
Build a fully offline retrieval-augmented generation pipeline on Android — quantized embedding models via ONNX Runtime, HNSW vector indexing inside SQLite with
Kotlin Context Parameters in Practice: Replacing Service Locators, Scoping Database Transactions, and the Zero-Boilerplate Patterns That Make Clean Architecture in KMP Actually Clean
Deep dive into Kotlin 2.2's context parameters as an architectural primitive — how they eliminate manual dependency threading across call chains, scope database
JSONB indexing: GIN vs expression indexes for mobile APIs
Deep dive into how mobile backends abuse JSONB columns as a 'schema-free' escape hatch, then suffer catastrophic query performance at scale. Cover GIN index int
PostgreSQL partial indexes: drop your app-layer uniqueness checks
Deep dive into combining partial unique indexes (WHERE deleted_at IS NULL) with deferred constraint checking and tenant-scoped composite indexes to enforce comp
gRPC and Protocol Buffers for Mobile API Backends: Binary Wire Format, Bidirectional Streaming, and the Code Generation Pipeline That Gives You Type-Safe Clients Across Android, iOS, and KMP with 60% Less Payload Than REST+JSON
Deep technical comparison of gRPC vs REST for mobile backends — covering protobuf schema design for mobile-friendly field evolution, gRPC-Web as a fallback for
PostgreSQL advisory locks beat Redis for rate limiting
Using pg_try_advisory_xact_lock with connection pooling (PgBouncer in transaction mode) to implement sliding-window rate limiting directly in PostgreSQL, elimin
Swift 6 + Kotlin coroutines: fixing KMP data races
Deep dive into the real friction points when KMP-exported Kotlin coroutine-based APIs cross into Swift 6's strict concurrency world — how @Sendable closures, gl
Compose Multiplatform's Skia Rendering on iOS: Profiling Metal Shader Compilation Stalls, Texture Atlas Thrashing, and the Platform-Specific Patterns That Actually Hit 120fps on ProMotion
Deep dive into the Skiko/Skia rendering pipeline on iOS — how Compose Multiplatform bypasses UIKit, why first-frame Metal shader compilation causes hitches, how
On-Device LLM Inference via KMP and llama.cpp: Memory-Mapped Model Loading, ANE/NNAPI Accelerator Delegation, and the Thermal Budget Patterns That Make 3B-Parameter Models Production-Ready on Mobile
Build a KMP shared module that wraps llama.cpp through cinterop (iOS) and JNI (Android), covering mmap-based model loading to avoid OOM kills, hardware accelera
Ktor at 50K connections: coroutines vs virtual threads
Deep technical comparison of Ktor's coroutine dispatcher vs JVM virtual threads (Project Loom) for high-concurrency mobile backends — thread pinning pitfalls, s
PostgreSQL RLS: your last defense against tenant data leaks
Deep dive into implementing RLS policies as the last line of defense against tenant isolation bugs — covering policy design with current_setting vs session vari
PostgreSQL LISTEN/NOTIFY as a lightweight job queue: replacing Redis for your startup's background tasks
Building a zero-dependency job queue using PostgreSQL's LISTEN/NOTIFY channels with SKIP LOCKED advisory locks, comparing throughput benchmarks against Redis-ba
SQLite WAL Mode, Connection Pooling, and Room's Query Planner: The Mobile Database Performance Patterns That Survive Offline-First at Scale
Deep dive into SQLite's WAL vs DELETE journal modes, how Room's InvalidationTracker triggers unnecessary recomputations, connection pool sizing for concurrent r
Compose stability: the recomposition model senior devs get wrong
Deep dive into how the Compose compiler assigns stability to types, how strong skipping mode (default since Compose Compiler 2.0) changes the old mental model o
Partial Indexes and Expression Indexes in PostgreSQL: The Query Optimization Patterns That Cut Our Mobile API P99 Latency by 80%
Deep dive into PostgreSQL's underused indexing strategies — partial indexes for soft-deleted rows, expression indexes for JSONB fields, covering indexes to enab
Recursive CTEs in PostgreSQL: kill N+1 queries in mobile apps
Deep dive into using PostgreSQL recursive common table expressions to efficiently query hierarchical data structures common in mobile apps — threaded comments,
Modular monolith in Kotlin: microservice boundaries without the tax
Step-by-step architecture for structuring a Ktor or Spring Boot backend as a modular monolith using Kotlin's internal modifier, JPMS module-info boundaries, and
HikariCP config (WRONG)
Deep dive into the connection pooling layer between your mobile backend and PostgreSQL — covering HikariCP misconfiguration antipatterns (maxLifetime vs server-
Embedding Local LLMs in Your Mobile App: llama.cpp via KMP, 4-Bit Quantization Tradeoffs, and the Streaming Architecture That Keeps Your UI at 60fps
Practical integration of on-device LLM inference in production mobile apps using KMP bindings to llama.cpp, covering GGUF model selection, Q4_K_M vs Q5_K_S quan
Row-level security in PostgreSQL: SaaS tenant isolation without query changes
Implementing PostgreSQL RLS policies with JWT-based tenant context using set_config/current_setting, combining it with connection pooling (PgBouncer in transact
Server-Sent Events as Your Mobile Real-Time Layer: Automatic Reconnection, Last-Event-ID Recovery, and Why SSE on Ktor Replaces 90% of Your WebSocket Use Cases
Deep dive into implementing SSE with Ktor for mobile backends — covering EventSource protocol semantics, Last-Event-ID replay for offline recovery, backpressure
Kotlin coroutines meet Swift 6 concurrency in KMP
Deep dive into how Kotlin coroutines map to Swift's async/await at the KMP boundary — covering SKIE vs KMP-NativeCoroutines, handling cancellation propagation a
Zero-downtime PostgreSQL migrations at scale
Deep dive into non-blocking schema migrations for PostgreSQL — covering advisory lock strategies to coordinate migration runners, the ghost table pattern (used
Designing Idempotent APIs for Mobile Clients: Retry Logic, Idempotency Keys, and the Patterns That Prevent Double Charges
Deep dive into implementing database-backed idempotency keys in Ktor/Spring Boot, client-side retry strategies with exponential backoff and jitter for unreliabl
Partial indexes in PostgreSQL: wins your mobile backend misses
Deep dive into PostgreSQL partial indexes (CREATE INDEX ... WHERE), expression indexes, and covering indexes (INCLUDE) — showing how targeted indexing strategie
Gradle at scale: how we cut KMP CI from 45 to 12 min
Deep dive into Gradle configuration cache compatibility in multi-module KMP projects, build cache hit optimization with remote caching (Develocity/Gradle Enterp
SQLite as your server database: a production guide
Deep dive into using SQLite as a production server database for early-stage startups — covering WAL mode configuration, critical PRAGMA settings (journal_mode,
Replacing Your Message Queue with PostgreSQL: LISTEN/NOTIFY, SKIP LOCKED Queues, and When Kafka Is Overkill for Your Startup
Deep dive into using PostgreSQL as a lightweight job queue and event bus using LISTEN/NOTIFY for pub/sub, FOR UPDATE SKIP LOCKED for reliable worker queues, and
The Modularization Trap: When Clean Architecture Becomes Your Startup's Bottleneck
A pragmatic breakdown of how over-modularized Android/KMP codebases create exponential Gradle build times, circular dependency nightmares, and onboarding fricti
Local RAG on mobile: vector search under 200ms
Implementing a fully offline retrieval-augmented generation system using sqlite-vss for vector similarity search, ONNX Runtime for on-device embedding generatio
Connection pool tuning: HikariCP defaults kill mobile backends
Deep dive into why the default HikariCP pool size formula (connections = CPU cores * 2 + 1) breaks down for mobile backends with bursty traffic patterns, how to
End-to-End Kotlin: Sharing Type-Safe API Contracts Between Ktor and Compose Multiplatform with Kotlinx.Serialization and Ktor Resources
Building a shared KMP module that defines your entire API surface — routes, request/response DTOs, validation rules, and error types — consumed identically by y
Zero-downtime PostgreSQL migrations at scale
Deep dive into the specific PostgreSQL migration patterns (CREATE INDEX CONCURRENTLY, advisory locks, gh-ost-style shadow table swaps, and NOT VALID constraint
Bridging Kotlin Coroutines and Swift 6 Structured Concurrency in KMP: Building Leak-Free Shared Async APIs
How to design KMP shared modules that expose idiomatic async APIs on both platforms — using SKIE and custom expect/actual patterns to map Kotlin Flows to AsyncS
Advanced Claude Code CLI skills that actually change how you work
Practical Claude Code CLI techniques for senior engineers: slash commands, MCP servers, custom hooks, and multi-file editing patterns that replace entire toolch
Connection pooling for serverless mobile backends
Deep dive into how serverless functions (Lambda, Cloud Run, edge workers) interact with PostgreSQL connection limits, comparing transaction-mode PgBouncer, Supa
MCP in Practice: Connecting Claude to Jira, Excel, and Building Multi-Agent Workflows in Minutes
How Model Context Protocol turns Claude into a Jira analytics engine — connecting via MCP connector, building agent teams, extracting Lead Time, sprint data, an
OpenCode vs Claude Code: free agentic coding setup
How to set up OpenCode with cheap or free model providers like OpenRouter, Pollinations, and Copilot subscriptions to get agentic coding without the 100/month p
Room 3.0 Migration Guide: From KAPT to KSP, Coroutines-First APIs, and KMP Web Support
What changes in Room 3.0 for existing projects: dropping KAPT for KSP-only codegen, Kotlin-only generated code, new coroutines-first API surface, and the new we
Running Gemma 3 on-device: memory, quantization, and KMP
Practical engineering deep-dive into shipping on-device LLMs — comparing 4-bit vs 8-bit quantization impact on output quality and latency, managing memory press
Self-hosting AI models on a budget VPS: a cost analysis
Practical guide to running open-source LLMs on cheap VPS instances — hardware requirements, model selection, performance benchmarks, and cost comparison vs API
Ktor 3 vs Spring Boot 3: Choosing your mobile backend
Head-to-head comparison of Ktor's coroutine-native request handling versus Spring Boot's Project Loom virtual threads — covering cold start times, memory footpr
Zero-downtime schema migrations at scale
Step-by-step implementation of expand-contract migrations using PostgreSQL advisory locks, transactional DDL, and blue-green deployment slots — covering the exa
Jetpack Compose Recomposition at Scale: How Strong Skipping Mode Changes the Stability Rules You Learned
Deep dive into Compose compiler's stability inference system, how strong skipping mode (now default) changes which classes need @Stable/@Immutable annotations,
PostgreSQL Partial Indexes and Expression Indexes: Cutting Your Mobile Backend Query Times by 90%
Deep dive into using partial indexes for soft-deleted records, expression indexes for JSONB columns, and covering indexes (INCLUDE) to eliminate heap fetches —
SQLite WAL Mode and Connection Strategies for High-Throughput Mobile Apps: Beyond the Basics
Deep dive into SQLite WAL2 mode, BEGIN CONCURRENT, connection pooling patterns for Room/SQLDelight, and how to avoid SQLITE_BUSY under real concurrency — with b
Unit Economics That Actually Matter: Calculating True LTV When Your Mobile App Has Both Subscription and IAP Revenue Streams
Build a practical unit economics model that accounts for blended revenue streams (subscriptions + consumable IAPs), cohort-based retention curves, and refund ra
Event sourcing with CQRS for mobile backends
Step-by-step implementation of event sourcing for a mobile app backend, covering event store design in PostgreSQL, projection rebuilds, snapshotting strategies
MVI state machines: one architecture for Compose & SwiftUI
Building a production-grade MVI state machine in pure Kotlin that drives both Compose and SwiftUI views, handling side effects, state restoration, and testing w
PostgreSQL Connection Pooling for Mobile Backends at Scale
Deep dive into PgBouncer vs Supavisor vs built-in pool sizing, covering transaction vs session mode tradeoffs, how connection storms from mobile clients differ
Running LLMs On-Device in Android: GGUF Models, NNAPI, and the Real Performance Tradeoffs
A deep technical walkthrough of shipping on-device LLM inference in production Android apps — covering model quantization formats (GGUF, QLoRA), hardware accele
Bridging Kotlin Coroutines and Swift in KMP
Deep dive into the practical patterns for exposing Kotlin Flow and suspend functions to Swift 6 structured concurrency — covering SKIE vs manual wrappers, cance
I Built an AI Content Pipeline That Publishes a Blog Post in 83 Seconds
How I replaced n8n, Zapier, and paid automation tools with a custom Node.js pipeline that generates, reviews, and publishes content using Claude CLI. Real metrics from production.
Kotlin Multiplatform Room: Shared DB Without the Tax
Now that Room has official KMP support, examine the real-world migration path from platform-specific persistence (Room on Android, Core Data/GRDB on iOS) to a s
Contract Testing for Microservices: Stop Breaking Production
Implementing consumer-driven contract tests with Pact and Spring Cloud Contract in Kotlin backend services, covering schema evolution strategies, CI pipeline in
I Built Custom Claude Code Skills for Android Development — Here's How They Work
How custom slash commands for Claude Code cut my setup time from 20 minutes to 5 seconds per feature. Open source on GitHub.
Compose Multiplatform Navigation: Best Pick in 2026
A deep architectural comparison of navigation frameworks for Compose Multiplatform apps — examining type-safe argument passing, lifecycle management across iOS/
Eliminating ANRs at Scale: Android Responsiveness Guide
Deep dive into the architecture patterns that prevent ANRs before they happen — structured concurrency with Kotlin coroutines, main-thread budget accounting, an
Dependency Injection Beyond Basics: Hilt's Hidden Cost
Examining how over-reliance on DI frameworks like Hilt leads to bloated module graphs, hidden runtime failures, and testability theater — contrasting with manua
How Custom MCP Servers Cut AI Token Usage by 95%
Building custom MCP servers as a dev tool strategy: how indie developers can reduce AI costs and improve coding workflows by giving LLMs structured context inst
I Hardened My VPS in One Session — Here's the Checklist
A practical, step-by-step security hardening guide for solo developers running production apps on a VPS — covering WireGuard VPN, Docker port isolation, SSH loc
Kotlin Flow Patterns Every Senior Android Dev Must Know
Advanced Flow operators for production Android apps: shareIn vs stateIn, conflate vs buffer, retry with exponential backoff, and testing Flows with Turbine
AI Governance Architecture for Solo Devs
How indie developers and small startups can build AI governance into their products from day one — practical patterns for solo devs shipping AI features into re
How Much Does It Cost to Build an MVP in 2026?
A detailed breakdown of MVP development costs by platform, features, and approach. Real numbers from a developer who builds them.
Why Agent Testing Is Broken (And How to Fix It)
LLM agents broke the testing contract. Here are practical, budget-friendly strategies for indie developers to test non-deterministic AI outputs without enterprise infrastructure.
Case Study: Building a Cross-Platform Health App with Kotlin Multiplatform
How we built HealthyDesk — a production-ready KMP app for Android, iOS, and Desktop — with clean architecture, 20+ modules, and 80% shared code.