Why Your SaaS Node Backend Will Fail at 10k Requests/Minute (and How to Stress‑Proof It Without Rewriting)

Naïve Node.js SaaS backends silently fail at scale: jobs vanish on deploy, webhook duplicates double‑bill customers, and MFA state drifts. See exactly what breaks at 10k RPM, how to stress‑test it yourself, and how KeelStack already hardens your Node + TypeScript backend with idempotent queues, atomic job claiming, and per‑action MFA enforcement.