In the last article, I walked through finding and fixing the slow parts of a SaaS before launch: N+1 queries, missing indexes, unbounded payloads, the usual suspects. That work makes the product fast. It says nothing about whether the product is actually ready to run unattended, at 3am, when something inevitably goes wrong.
This is the closing article of Module 4 in the Full Stack SaaS Masterclass, and it's meant as a checklist you go through before flipping the switch on a real launch, not a tutorial you follow once and forget. Every item on it is something I've seen skipped on a first release, and every skip eventually became an incident.
"Production ready" doesn't mean gold-plated. It means the gaps that turn a minor bug into a multi-hour outage have been closed, and the ones that remain are gaps you've consciously accepted rather than ones nobody thought about. That distinction is the whole point of a checklist: it forces the conscious part.
Configuration and secrets are locked down
The most common first-launch mistake isn't a code bug. It's a config that quietly behaved differently than everyone assumed. A .env file with production credentials committed by accident. A CORS policy left wide open because it was easier during development. A database connection pool sized for a laptop, not for concurrent traffic.
