Code Room
On-callMedium
Question
A deploy is half rolled out — some servers run the new version, some the old — and users get inconsistent behavior or errors depending on which they hit. What do you do?
What a strong answer looks like
Stop the bleeding first (mitigate), then form hypotheses from real signals. Separate root cause from symptom, communicate status as you go, and close with what prevents a repeat.
Learn the concepts
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Run or narrate your approach, then ask the coach.