Nobody deployed anything is true of your repository and false of the system. The model provider, a tool behind an API, the knowledge base and the traffic mix all change without a commit. Segmentation comes before theory: a broken intent and a mix shift produce the same headline and need different fixes.
Updated Sep 2026 · Grounded in real Forward Deployed Engineer interview loops and written to a senior-engineer editorial bar.
Nobody deployed anything is true of your repository and false of the system. The model provider, a tool behind an API, the knowledge base and the traffic mix all change without a commit. Segmentation comes before theory: a broken intent and a mix shift produce the same headline and need different fixes.
This is a final-round prompt at the agent companies, and it is scored on order of operations. The strong candidate decomposes the metric before naming a cause, distinguishes a broken intent from a changed mix in the first table they draw, and ends with the regression suite that would have caught it before customers did. The weak candidate says 'the model probably drifted' and starts reading transcripts at random.
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