https://blog.nguyenluu.dev/ Engineering notes on AI, cloud, software architecture, and the systems behind them. https://blog.nguyenluu.dev/posts/hello-blogtinum/ https://blog.nguyenluu.dev/posts/hello-blogtinum/ Fri, 10 Jul 2026 00:00:00 GMT Why I built Blogtinum, how its static pipeline works, and how Markdown, Vue SSR, and a Git-backed Admin fit together. https://blog.nguyenluu.dev/posts/llm-evaluation-production-quality/ https://blog.nguyenluu.dev/posts/llm-evaluation-production-quality/ Thu, 16 Jul 2026 00:00:00 GMT Design production-shaped LLM evaluations with explicit tasks, calibrated graders, segmented analysis, and defensible release gates. https://blog.nguyenluu.dev/posts/designing-reliable-webhooks/ https://blog.nguyenluu.dev/posts/designing-reliable-webhooks/ Wed, 15 Jul 2026 00:00:00 GMT Design webhooks as signed, retrying, observable delivery contracts that both providers and consumers can operate safely. https://blog.nguyenluu.dev/posts/time-and-ordering-in-distributed-systems/ https://blog.nguyenluu.dev/posts/time-and-ordering-in-distributed-systems/ Tue, 14 Jul 2026 00:00:00 GMT Choose physical, logical, vector, and hybrid clocks by the ordering facts a distributed protocol actually needs. https://blog.nguyenluu.dev/posts/rate-limiting-algorithms-compared/ https://blog.nguyenluu.dev/posts/rate-limiting-algorithms-compared/ Mon, 13 Jul 2026 00:00:00 GMT Compare six rate limiters by boundary behavior, burst fairness, precision, memory, weighted costs, clocks, headers, and deterministic tests. https://blog.nguyenluu.dev/posts/lsm-trees-compaction-read-amplification/ https://blog.nguyenluu.dev/posts/lsm-trees-compaction-read-amplification/ Sun, 12 Jul 2026 00:00:00 GMT LSM trees turn random writes into sorted runs, then spend compaction, read, and space amplification to keep those runs useful. https://blog.nguyenluu.dev/posts/http-evolution-http1-http3/ https://blog.nguyenluu.dev/posts/http-evolution-http1-http3/ Sat, 11 Jul 2026 00:00:00 GMT Follow HTTP's evolution from ordered text messages to multiplexed QUIC streams and plan a measurable, fallback-safe HTTP/3 rollout. https://blog.nguyenluu.dev/posts/evolutionary-architecture-fitness-functions/ https://blog.nguyenluu.dev/posts/evolutionary-architecture-fitness-functions/ Thu, 09 Jul 2026 00:00:00 GMT Turn architectural intent into automated fitness functions with explicit scope, thresholds, ownership, exceptions, and a path for gradual change. https://blog.nguyenluu.dev/posts/profiling-real-performance-bottlenecks/ https://blog.nguyenluu.dev/posts/profiling-real-performance-bottlenecks/ Wed, 08 Jul 2026 00:00:00 GMT Find real Node.js bottlenecks with distributions, profiles, load tests, and production-safe experiments instead of intuition. https://blog.nguyenluu.dev/posts/queueing-theory-for-capacity-planning/ https://blog.nguyenluu.dev/posts/queueing-theory-for-capacity-planning/ Tue, 07 Jul 2026 00:00:00 GMT Turn arrival rates, service demand, variability, and queue limits into capacity hypotheses that saturation experiments can verify. https://blog.nguyenluu.dev/posts/jit-compilers-speculation-and-deoptimization/ https://blog.nguyenluu.dev/posts/jit-compilers-speculation-and-deoptimization/ Mon, 06 Jul 2026 00:00:00 GMT Follow a tiered JIT as runtime feedback becomes guarded optimized code and deoptimization reconstructs correct generic execution. https://blog.nguyenluu.dev/posts/structured-concurrency-lifetimes-cancellation/ https://blog.nguyenluu.dev/posts/structured-concurrency-lifetimes-cancellation/ Sun, 05 Jul 2026 00:00:00 GMT Make asynchronous work tractable by nesting task lifetimes, propagating failure, and completing cleanup before scopes return. https://blog.nguyenluu.dev/posts/typescript-soundness-and-escape-hatches/ https://blog.nguyenluu.dev/posts/typescript-soundness-and-escape-hatches/ Sat, 04 Jul 2026 00:00:00 GMT Understand where TypeScript deliberately trusts the programmer, then contain those assumptions with strict configuration, narrow APIs, validation, and adversarial tests. https://blog.nguyenluu.dev/posts/hash-tables-collisions-and-resizing/ https://blog.nguyenluu.dev/posts/hash-tables-collisions-and-resizing/ Fri, 03 Jul 2026 00:00:00 GMT Understand hash-table correctness through hashing, collision resolution, deletion, load factors, and incremental resizing. https://blog.nguyenluu.dev/posts/generics-variance-and-constraints/ https://blog.nguyenluu.dev/posts/generics-variance-and-constraints/ Thu, 02 Jul 2026 00:00:00 GMT Design TypeScript generics that preserve inference, model variance honestly, and avoid common soundness traps in reusable APIs. https://blog.nguyenluu.dev/posts/agentic-workflows-state-machines-human-approval/ https://blog.nguyenluu.dev/posts/agentic-workflows-state-machines-human-approval/ Wed, 01 Jul 2026 00:00:00 GMT Build agentic workflows as durable state machines with bounded tools, proposal-bound approvals, idempotent effects, and testable recovery. https://blog.nguyenluu.dev/posts/background-job-systems/ https://blog.nguyenluu.dev/posts/background-job-systems/ Tue, 30 Jun 2026 00:00:00 GMT Build background jobs around durable state, leased attempts, bounded retries, idempotent effects, and evidence operators can trust. https://blog.nguyenluu.dev/posts/distributed-locks-leases-fencing-tokens/ https://blog.nguyenluu.dev/posts/distributed-locks-leases-fencing-tokens/ Mon, 29 Jun 2026 00:00:00 GMT Make lease-based coordination safe by fencing stale owners at every protected resource with monotonic tokens. https://blog.nguyenluu.dev/posts/mvcc-snapshots-visibility-vacuum/ https://blog.nguyenluu.dev/posts/mvcc-snapshots-visibility-vacuum/ Sun, 28 Jun 2026 00:00:00 GMT MVCC serves stable snapshots from versioned rows, then relies on visibility metadata and vacuum horizons to reclaim the history readers no longer need. https://blog.nguyenluu.dev/posts/browser-security-origins-cors-csp/ https://blog.nguyenluu.dev/posts/browser-security-origins-cors-csp/ Sat, 27 Jun 2026 00:00:00 GMT Design browser-facing systems by separating origin isolation, cross-origin read permission, credentials, execution policy, and embedding controls.