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Client-side validation is UX. Server-side validation is security. And a schema is not an auth guard — here's the fix that still ships an account takeover, and how to catch it in review.

Awaiting four independent API calls in sequence instead of parallel can triple your endpoint latency. Here's the pattern, the math, and how to catch it in review.

`forEach` doesn't return a Promise, so `await` before it resolves instantly. Every async callback fires and is forgotten — this is how batch processors ship broken.

Your endpoint is async but it still freezes the server. Here's the synchronous CPU work pattern that blocks Node's event loop and how senior devs catch it in review.

Open a modal 10 times without cleanup and you've got 10 stacked timers silently draining memory. Here's what this looks like in a PR and how senior devs catch it.

Floating promises — async calls nobody awaits — don't crash immediately. They fail silently, corrupt state, and get cut off by serverless runtimes. Here's what to look for in code review.