Describe a time when something you did -- a deploy, a config change, a code change -- caused a production issue that affected users. Walk me through the incident: what happened, how you responded in the moment, and what came out of the postmortem.
The interviewer is looking for: your ownership of the mistake, your incident response instincts, how you communicate during high-pressure moments, and whether you focus on systemic fixes rather than individual blame.
Note: This is about the incident response and aftermath, not the debugging process. Focus on ownership, communication, and systemic learning.
How to approach it
- Hint 1
Choose an incident where your action was a direct or significant contributing cause. Don't pick something where you were just on the response team. The interviewer wants to see how you handle being the person who caused the problem.
- Hint 2
Cover the timeline: what did you deploy or change, when did you realize something was wrong, what was the user impact, how did you communicate with the team and stakeholders during the incident, and what you did to resolve it. Be honest about mistakes made during the response too.
- Hint 3
Focus the ending on the postmortem and systemic improvements. The best answers advocate for blameless postmortems and describe specific process, tooling, or architectural changes that prevented recurrence. Show that you pushed for systemic fixes rather than just promising to be more careful.
Ready to answer it out loud?
Record your answer in 1:30 and Preptile scores it 1–10 with specifics — what landed, what you skipped, and what to say next time.
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