Choosing a real failure, taking genuine responsibility, and showing what changed afterwards.
3 questions in Behavioural & Culture Fit.
Own the change that caused it, walk the timeline from detection to recovery in real minutes, separate your mistake from the system that let it through, and say which fix is still in place today. Interviewers score the honesty of the timeline before the cleverness of the fix.
Pick a failure that was genuinely yours and materially consequential, spend most of the answer on the specific decision that caused it and the concrete change you made afterwards, and resist both the fake failure and the blame-shifted one.
Choose feedback about your effect on other people rather than a skills gap, quote it close to how it was said, describe the reaction you actually had before the acceptance, and show a specific behavioural change that the person who gave it could confirm.