Debugging interviews reward investigation process over a lucky first patch

Live debugging rounds on broken UIs or unfamiliar repos are evaluated on how the candidate investigates, not on how quickly they reach a working fix. Recommended practice is to restate expected versus actual behavior, identify the layer where the fault likely sits, form one testable hypothesis, and run the cheapest probe before editing code. Guides from several interview-prep sources emphasize this sequence over rewriting components or making silent, trial-and-error changes. Interviewers tend to watch how candidates narrow the search space, and a patch that hides the symptom without finding the root cause can score poorly. Some employers restrict AI or external tools during these rounds, so candidates are advised to confirm the rules with the recruiter beforehand.