The moment we realized our staging environment was broken

It was 3 PM on a Thursday, and our team was scrambling. A critical API change had just been merged to main, but the staging environment—our supposed safety net—was showing false positives. The integration tests passed, but the mobile app was completely broken in production.

That's when we knew: our shared staging environment was failing us.

The Problem: Shared Staging Is Broken by Design

Like many engineering teams, we operated with a single, shared staging environment. Every developer deployed their changes to the same place, leading to: