Tech Blog
Frontend deep dives, architecture design, performance optimization, and development insights
Bank Card BIN Lookup Guide: IIN, Issuer Identification, Card Networks, and Luhn Checks
A practical guide to bank card BIN/IIN lookup: what it can identify, what it cannot verify, how Luhn checks differ, and how to use BIN data safely in support, routing, and risk workflows.
JWT Authentication Best Practices: Algorithms, Storage, and Revocation
JWT authentication best practices: structure and algorithms, common mistakes (sensitive data in payload, using JWT as session), algorithm attacks (none, RS256/HS256 confusion), access/refresh token design, secure storage (localStorage vs cookie), revocation with jti, CSRF and SameSite.
PostgreSQL Indexing and Query Optimization: A Practical Guide
A practical guide to PostgreSQL indexing and query optimization: B-tree, GIN, GiST, BRIN, partial and expression indexes, reading EXPLAIN ANALYZE, composite index design, statistics and autovacuum, and a real order-query optimization walkthrough.
React 19 and Server Components: A Deep, Practical Guide
A practical deep dive into React 19 and React Server Components: new hooks (use, useOptimistic, Actions), the RSC execution model, 'use client' boundaries, server-side data fetching, streaming with Suspense, caching, and the real pitfalls of migrating client-only apps.
Redis Caching Patterns for Production: Penetration, Breakdown, Avalanche
Production-grade Redis caching patterns: Cache Aside / Read-Write Through / Write Behind strategies, cache penetration (bloom filter), breakdown (mutex), avalanche (random TTL, multi-level cache), consistency, eviction policies, hot/big keys, and a product-detail caching architecture.
TypeScript Advanced Types in Practice: From Conditional Types to Type-Level Programming
A hands-on breakdown of TypeScript's advanced type system: conditional types, infer, mapped types with key remapping, template literal types, recursive types, a real type-gymnastics challenge, the boundary between types and runtime, and performance pitfalls like instantiation depth limits.
Electron Desktop App Development Complete Guide: From Setup to Production
Build cross-platform desktop applications from scratch, covering main/renderer process communication, window management, security hardening, native module integration, auto-update deployment, and performance optimization with real-world lessons learned.
Frontend Code Standards & Engineering: ESLint + Prettier + Husky Full Workflow
Build enterprise-grade frontend code quality infrastructure from scratch, covering ESLint Flat Config migration, Prettier configuration, Husky + lint-staged automation, commitlint commit validation, VS Code team config sync, and CI pipeline integration with real migration experience and common pitfalls.
JavaScript Event Loop & Async Programming Deep Dive: Complete Chain from Macrotasks to Microtasks
An in-depth exploration of the JavaScript event loop mechanism, covering the call stack, task queues, microtask vs macrotask differences, Promise/A+ implementation internals, async/await fundamentals, Node.js event loop phases, and real-world performance tuning techniques.
Monorepo Engineering in Practice: PNPM Workspaces, Turborepo Pipelines, and Scaling to 200 Packages
A production-grade Monorepo practice guide covering PNPM workspace configuration, Turborepo pipeline optimization, dependency management, shared configs, Monorepo CI/CD, and real migration data from 15 repos to one Monorepo.
Node.js Stream Deep Dive: From Backpressure to Pipeline Patterns in Production
An in-depth exploration of Node.js Stream's four types (Readable, Writable, Transform, Duplex), backpressure mechanics, proper pipe vs pipeline usage, custom stream implementation, performance benchmarks, and production-grade applications in large file processing, logging systems, and data ETL pipelines.
Playwright E2E Testing Deep Dive: From Test Cases to CI Integration
A comprehensive guide to Playwright testing framework in production, covering locator strategies, assertions, network interception and mocking, visual regression testing, authentication reuse, parallel execution, and CI/CD integration with real-world patterns.
PostgreSQL Query Optimization Deep Dive: EXPLAIN ANALYZE, Index Strategies, and Real-World Tuning
A production guide to PostgreSQL query optimization covering EXPLAIN ANALYZE interpretation, index types and selection, query plan reading, partition pruning, statistics tuning, connection pooling, and 5 real-world optimization case studies from billion-row tables.
React Server Components in Production: Architecture, Patterns, and 15 Common Pitfalls
A battle-tested guide to React Server Components covering the mental model shift, Server/Client boundary patterns, streaming SSR with Suspense, Server Actions anti-patterns, cache invalidation strategies, and a real migration from Pages Router to App Router.
WebAuthn & Passkeys: Building Passwordless Authentication for Production 2026
A complete implementation guide to WebAuthn and Passkeys, covering credential creation, authentication ceremonies, platform vs cross-platform authenticators, attestation formats, server-side verification with Node.js, and real-world deployment patterns.
WebRTC in Production: Signaling, NAT Traversal, SFU Architecture, and Real-World Pitfalls
A battle-tested guide to WebRTC production deployment covering signaling protocols, STUN/TURN NAT traversal, SFU vs MCU vs P2P architectures, media optimization with simulcast and SVC, connection recovery, and 10 common production pitfalls.
Grafana Observability in Practice: Dashboards, PromQL, Alerting, and Provisioning
A practical guide to Grafana: building effective dashboards, writing PromQL, templating with variables, multi-source (Prometheus/Loki/Tempo), alerting rules, annotations, and provisioning dashboards as code.
LLM Reasoning Models in Production: o1, o3, DeepSeek-R1, QwQ Best Practices
A practical guide to reasoning LLMs (OpenAI o1/o3, DeepSeek-R1, QwQ, Claude extended thinking) covering when to use them, prompt design differences, cost/latency tradeoffs, streaming and tool-calling patterns, evaluation, and common pitfalls in production.
MongoDB Document Modeling: Embedding vs Referencing, Indexes, and Aggregation Pipelines
A practical guide to MongoDB data modeling: embedding vs referencing, schema design patterns (Extended Reference, Subset, Bucket), indexing (compound, covered, TTL), aggregation pipelines, transactions, and performance tuning.
MySQL Performance Tuning in 2026: EXPLAIN, Indexing, and Query Optimization
A practical MySQL performance guide covering EXPLAIN analysis, B+Tree and covering indexes, composite index leftmost-prefix rule, slow query log, InnoDB buffer pool tuning, JOIN and pagination optimization, and connection pooling patterns.