A practical guide to CORS for builders: origins, preflights, credentials, common browser errors, and the server configs that actually fix them without opening your API to the world.
A practical guide to env vars, secret managers, rotation, and least privilege — with delivery patterns for web apps, workers, CI/CD, and Kubernetes.
A practical guide to CSRF protection in modern apps: SameSite cookies, synchronizer tokens, custom headers, Fetch Metadata, and the CORS mistakes that quietly reopen old holes.
A practical guide to choosing role-based, attribute-based, or relationship-based authorization for real products, with examples for SaaS apps, internal tools, B2B org models, and shared resources.
A practical guide to shipping passkeys with WebAuthn: registration, sign-in, recovery, account settings, and the RP ID/origin gotchas that usually break rollouts.
A practical guide to choosing session cookies, JWTs, or PASETO for web apps, SPAs, mobile apps, and APIs without cargo-culting stateless auth.
A practical guide to OAuth 2.1 and OpenID Connect for real apps: authorization code + PKCE, refresh tokens, ID tokens, and machine-to-machine flows without the usual auth confusion.
A production-focused guide to right-sizing pools, setting timeouts that prevent stalls, and fixing Postgres/MySQL “too many clients/connections” errors with app and proxy patterns.
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.