p99 Latency Spiked at 2am
hardIncident scenarioCommonly asked~20 minHLD roundBar raiserHiring managerSenior / SDE-3AmazonUberRazorpayAtlassianFlipkartObservabilityResilienceCaching
The question, as asked
“You're on call. p99 latency on the checkout API just went from 200ms to 4 seconds. Error rate is flat. Walk me through what you do.”
Your answer, first
Commit something before anything unlocks. Saved on this device as you go.
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Worked answer in progress
This one is listed because it comes up constantly — the three-depth answer, follow-ups and red flags are being written. Attempt it above anyway; that part works, and the guides below cover the ground the model answer will.