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How I Build a Production SaaS in 2 Months: The Complete Checklist
Every production SaaS needs the same foundation. Here's the 40+ point checklist I use: auth, billing, database, API, email, monitoring, security — with architectural decisions and honest time estimates.
How I Detect Tampered PDFs in 9 Seconds (A Forensics Story)
A PDF contract arrives. How do you know if it's been edited? Here's the xref table trick and 7 forensic markers I built into htpbe.tech to detect PDF tampering.
EU VAT for Developers: The Complete Guide
EU VAT validation in Next.js breaks in ways tutorials don't cover. VIES caching, silent failures, reverse charge logic — here's what actually works.
Redis Rate Limiting for APIs: Sliding Window Without the Pain
How to implement sliding window rate limiting in a production API — Redis ZADD pattern, in-memory fallback, multi-tier limits by IP and API key, and the headers that make developers happy.
Stripe Webhooks Done Right: Production Architecture
Stripe retries webhooks for 72 hours. Naive handlers duplicate orders. Here's the production architecture: idempotency, BullMQ queues, signature verification.