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The customer calls: 'The model got worse and we changed nothing.' Walk me through your first two hours.

The signature production-ML incident, and a pure FDE test: a ranked differential diagnosis run live on a call, because 'nothing changed' is always false, and one hypothesis explains half of all cases.

Updated Sep 2026 · Grounded in real Forward Deployed Engineer interview loops and written to a senior-engineer editorial bar.

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