From Stack Trace to Suggested Fix in 4 Seconds: Building a Self-Healing .NET API Gateway.
<p>Last Tuesday my API gateway caught a <code>NullReferenceException</code>, streamed it to a dashboard in real-time, and pushed a draft code fix to the browser tab of the on-call engineer — before I finished reading the error myself. That sentence used to be vendor marketing. Now it's just my <code>Program.cs</code>.</p> <p>This is the architecture post-mortem. I built it on weekends. It runs in Docker. It cost me exactly $0 in LLM credits during development because <a href="https://groq.com" r









