The fix was simple, but finding it took hours. The problem wasn’t code complexity—it was the feedback loop. Slow feedback breaks focus, drains momentum, and kills developer experience (Devex).
A fast feedback loop is the core of good Devex. When engineers see results quickly, they can act without losing context. Every handoff, compile, test run, and deploy adds latency. At scale, this latency compounds, turning small delays into major productivity losses.
Short loops make errors visible earlier. Testing in seconds instead of minutes changes how teams work. Builds that finish in seconds keep the mental model fresh. Pull request checks that return instantly prevent idle time. Tight integration between coding, testing, and deployment means fewer context switches.
Long loops force developers into queues. Waiting on CI pipelines or manual approvals breaks concentration. By the time feedback arrives, the engineer has moved on to another task. Now they must reload the mental state, wasting time and risking mistakes.