Focus on the systemic changes that came out of the post-mortem, not just what went wrong. Did you automate the manual step? Add a monitoring gap?
Best answers: describe the incident clearly, demonstrate blameless analysis, identify systemic causes (not just the immediate trigger), propose preventive measures (automation, monitoring, process changes), and show follow-through on action items. Strong candidates distinguish between human error and system design problems.
Reveals operational culture and learning mindset. Red flag: blaming individuals. Good sign: identifying systemic improvements and following through on them.