Your app keeps crashing. We find why, not just where.

“The app crashes in production but never on your machine.”

Different load, different data, different timing. 'Works locally' means nothing about a race condition or a payload shape your local testing never produced.

“One component throws and the entire page goes white.”

React has supported error boundaries since version 16 specifically to contain this — a component that throws during render unmounts everything above it unless something catches it. Most vibe-coded apps have zero.

“The server process dies and the platform just restarts it, silently.”

An auto-restart hides the crash from you but not from the user who was mid-request when it happened. Nobody's looking at why it keeps happening because the symptom keeps disappearing on its own.

“A serverless function times out under real traffic, not under testing.”

Serverless functions have a hard execution ceiling. Code that's fine at 200ms locally can hit that ceiling once it's doing a real database round trip plus a third-party API call under production latency.

“An unhandled promise rejection takes down the whole process.”

Since Node.js 15, an unhandled rejection crashes the process by default instead of just logging a warning. Older tutorials and a lot of AI-generated code still assume the old, forgiving behavior.

“The crash only shows up for one specific type of user or input.”

Usually a null or undefined case nobody tested — the free-tier user, the empty cart, the account created before a schema change. The stack trace points at it immediately once we can reproduce it.