A production-ready playbook for building forms that are fast, inclusive, and resilient — with copy-paste patterns for HTML, React, and your APIs.
A practical, production-safe guide to CPU and memory profiling across Node.js, Python, and Go with real commands, code snippets, and a field guide to reading flamegraphs.
Trade-offs, pitfalls, and production-ready code with SQL, Node, FastAPI, MongoDB and Elasticsearch examples.
A battle‑tested checklist and patterns: allowlists, size limits, magic‑byte checks, streaming to object storage, virus scanning, image/PDF sanitization, signed URLs, and safe download headers.
Practical patterns for rock‑solid APIs: spec styleguide, reusable components, Problem Details errors, auth & versioning, pagination, idempotency, testing, and CI gates. Includes a copy‑paste 3.1 template.
Practical, modern defaults for CSP, HSTS, Referrer-Policy, Permissions-Policy, COOP/COEP/CORP, X-Content-Type-Options, X-Frame-Options vs frame-ancestors, cookies, and cache controls—with NGINX/Apache/Express snippets.
Commands say 'do X', events say 'X happened'. Use sagas (orchestration or choreography) for long‑running, cross‑service workflows with compensations, idempotency, and reliable messaging.
Design principles and ready-to-use patterns: consistent subcommands, great help, smart defaults, colors/TTY, progress, JSON output, config precedence, auth, errors, exit codes, and distribution.
The 80% you actually need: Pods, Deployments, Services, Ingress/Gateway, Requests/Limits, Probes, Config & Secrets, HPA, storage, and the kubectl commands you’ll use daily.
Fixed/sliding windows, token & leaky buckets, GCRA, and real-world implementations (Redis, NGINX, Envoy). Covers headers, bursts, backoff, multi‑DC, and tuning.
UTC vs local time, offsets vs zones, DST edge cases, ISO 8601/RFC 3339, DB column types, and sane patterns in JS/Python/SQL. How to store, compare, schedule, and display time without pain.
Design access + refresh flows that are safe: short-lived access tokens, rotating refresh tokens with reuse detection, device-scoped sessions, and practical revocation strategies.