Debugging Starts with Behavior Not Code

Reading the code is the LAST step of debugging. Not the first. I've seen engineers spend 3 days reading through a codebase trying to find a bug. Meanwhile the fix was a config change pushed 2 days earlier. It wasn't in the code at all. The best debuggers I've worked with never start with code. They start with behavior. → What changed? → When did symptoms start? → Who's affected — all users or some? → What's the blast radius? Code is 200,000 lines of possibilities. Behavior is a finite set of symptoms. Start with the smaller search space. Form hypotheses about behavior. Then use code to validate or kill those hypotheses. Think of it as binary search on the system: each observation should eliminate half the problem space. AI can read code faster than any human. It can't observe production behavior and form contextual hypotheses about what went wrong. That's the skill. Skill #4 of 12 AI-proof engineering skills. → Follow for the full series. — #AIProofSkills #SoftwareEngineering #Debugging #SystemsThinking #EngineeringLessons #Engineering #ProductionDebugging #BuildInPublic

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The single most useful debugging question: "What changed between when it worked and when it didn't?" A deploy, a config push, a traffic spike, a third-party dependency update — 90% of production bugs trace back to something that changed. Code-first debugging misses this entirely. Behavior-first debugging catches it in minutes. What's your go-to first move when debugging a system you've never seen? 👇

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