POC-to-Production War Story: MangaAssist
This folder documents the complete journey of taking MangaAssist from a successful proof-of-concept to a production system serving 500K concurrent users on Amazon's JP Manga store.
Documents
| File | Description |
|---|---|
01-the-poc-that-fooled-us.md |
The POC story: what we built, why it worked, and the false confidence it created |
02-seven-production-catastrophes.md |
The 7 catastrophic failures that hit when we went live, with full LLM/system debugging diagrams |
03-how-we-overcame-each-failure.md |
The engineering war room: how we diagnosed and fixed each issue under pressure |
Quick Summary
The POC dazzled leadership with a 92% satisfaction score from 50 internal testers. Four months later, the production launch cratered with 23% error rates, 8-second P99 latencies, hallucinated prices that triggered a legal review, and a WebSocket meltdown during a Chainsaw Man volume drop. This is how we saved it.