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Code RoomHome screen returns 500
MediumPrep Room Coding #2584

Home screen returns 500

On-callReliability & on-callCode quality & reviewMid–Senior~30 min

At 21:30 your video app's home screen fails to load for everyone, returning a 500. Dashboards: the personalization service (which supplies the recommended rows) has been erroring at 100% since 21:28 after a deploy; your home-screen API calls personalization synchronously and propagates its error instead of degrading; everything else (playback, search, account) is healthy. The home-screen API itself wasn't deployed. How do you triage and mitigate?

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.

0:00 of about 30 min
Which questions mattered is sealed until you submit. Telling you now would just be handing over the edge cases.