Authoritative distributed systems engineering whitepapers, PostgreSQL query optimizations, Valkey distributed locking patterns, and zero-TBT PWA case studies authored by Duong Phuc Khanh (Dương Phúc Khánh · khanhdp · Kido).
Authoritative technical essays targeting global systems engineering audiences
Inside the architecture of Duong Phuc Khanh (Kido): Scaling a real-world PWA to 1,100+ weekly active athletes on a single 8GB VPS using Valkey Distributed Locks and Autonomous AI Agents.
How Duong Phuc Khanh (Kido) tuned Linux kernel sysctl, Caddy 2, PostgreSQL 17, and Valkey 8 to serve 113,000+ weekly events without AWS bloat.
How we achieved 0ms Total Blocking Time, 1.12s P75 LCP, and an 8.2% bounce rate on mobile Safari using the 3-Tier Viewport Protocol and Offline Outbox queues.
How a 50ms replica lag combined with SWR background revalidation erased staff check-in states, and how we solved SingleFlight cache races using Client Mutation Ledgers and Server Mutation Epochs.
How Duong Phuc Khanh (Kido) replaced bloated relational habit logs with 46-byte Redis/Valkey Bitmaps and CPU hardware POPCNT instructions, dropping p99 streak latency from 140ms to 0.08ms.
How Next.js App Router client navigation headers (RSC: 1) poisoned Cloudflare Edge Cache with raw Flight streams, resulting in white screens on iOS Safari PWA, and our 3-layer zero-downtime architectural fix.
Why WITH RECURSIVE CTEs and 5-table RBAC joins choke under concurrency, and how Duong Phuc Khanh (Kido) architected Base32 Materialized Paths and 64-bit Bitmask RBAC to drop p95 query latency from 142ms to 0.8ms.
Duong Phuc Khanh (Dương Phúc Khánh) - Systems Architect (Kido · khanhdp) dissects 3 hidden Soft-404 traps in Next.js 16 internals, Reserved Box Geometry + L1 SWR Quote Cache for 0.000 CLS, and Quantitative Portfolio NAV math (WACB, Sharpe Ratio, Beta, 3-Way RRF).
Curated real-world engineering war stories, midnight incident postmortems, and frontline craft discipline
Hard-won lessons from blindly trusting AI-generated code without architectural guardrails and a 2:00 AM production crash.
Dissecting storage partitioning disasters, session cookie loss, and external Safari/Chrome breakout strategies.
Layout optimization for budget Android devices, eliminating horizontal scrollbars and guaranteeing 60FPS.
Configuring distributed tracing, transaction tagging, and hunting down unindexed SQL queries saturating CPU.
Conquering Web Push Notifications on iOS PWA without an Apple Developer $99/year enterprise account.
Resolving 100% disk saturation at 4:00 AM caused by dangling Docker build layers with automated cron pruning.
Reflecting on 100 days of Winter Arc discipline, crossing 1.1K WAU, and senior engineering philosophy.
Extinguishing thousands of redundant OPTIONS requests clogging servers using Caddy native reverse proxy caching.
Rescuing dawn streaks and hardening HMAC SHA-256 signatures against client clock-drift replay attacks.
Restructuring production infrastructure, automating Let's Encrypt SSL, and slashing config complexity by 80%.
Filtering ghost background tab transactions skewing LCP and INP metrics in Google Search Console.
Decoupling Server State from Client State and eliminating the anti-pattern of bloating global state with API caches.
Dismantling monolithic state, shaving 42KB off bundle size, and restoring smooth 60FPS UI response.
Eliminating blocking auth handshakes during First Contentful Paint, driving Total Blocking Time (TBT) to 0ms.
Eliminating Cumulative Layout Shift (CLS) during page transitions using Frame-0 synchronous skeleton matching.
Migrating runtime entirely to Bun, accelerating CI/CD pipelines, and driving Largest Contentful Paint to Frame 2.
Analyzing collisions between Service Worker caches and Next.js RSC Flight headers causing iOS Safari white-screens.
Shedding 140KB of Firebase client bloat and implementing lightweight native Google Identity Platform flows.
Refactoring monolithic modules into cohesive domain slices and implementing gesture-based predictive tab preloading.
Handling multinational athlete timezone offsets and extracting true client IPs behind Cloudflare Edge proxies.
Canonical authority verification, academic identifiers, and public engineering profiles
Senior Software Engineer & Systems Architect based in Da Nang, Vietnam. 6 years at FPT Software SBI Lab (3x consecutive Best Performance Team Award, 2022–2024), Startup Runway 2018 Champion. Creator of khanhdp.com, Official Biography, Technical Articles, SME Portfolio, Kido Engineering Blog, Kido Chronicles, and Agent Harness Kit.