If you want a successful launch, the most critical checklist item isn't actually a technical feature—it’s the "Observability and Recovery" loop. In my experience leading builds at VOCE, you can have the most elegant React/TypeScript codebase in the world, but something will invariably break when it hits real-world traffic. The question is whether you’ll know about it before your users do. Before you flip the switch, ensure your telemetry is airtight. This means having real-time error tracking (like Sentry) and logging that spans your entire stack, from your frontend hooks to your background jobs in Convex. You need to be able to trace a failed Stripe checkout or an OAuth handshake error instantly. If you’re manually checking a database to see if a user signed up successfully, you aren’t ready to launch. Beyond the logs, make sure your "non-code" essentials are verified. I’ve seen great products stumble because they ignored Open Graph tags or SEO metadata, leading to broken link previews on social media during the peak of the launch hype. Double-check your billing webhooks and ensure your CI/CD pipeline is locked so you can push a hotfix in minutes, not hours. I’m always happy to dive deeper into specific integration hurdles or how to structure your backend for scale—feel free to reach out if you’re prepping for your next big release.