Tell me about a time when you had to make a critical technical decision with incomplete information and tight deadlines.
Behavioral rounds at FAANG and AI labs now include 1-2 design follow-ups. Each answer below ships with both.
The situation, your role, and the stakes, compressed.
A partner product team requested a forecasting API for capacity planning in 2 weeks. They couldn't provide historical patterns, didn't know the forecasting horizons they'd need, and couldn't define accuracy requirements. They just said: 'we need to predict capacity needs before resources run out.' I had to choose a foundation model, design the API contract, and architect for use cases I didn't fully understand.
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Design Follow-Ups
The new behavioral roundBehavioral rounds increasingly drop into 1-2 technical follow-ups that probe whether you could actually build the system you described. These are the design questions a real interviewer would ask after this STAR answer.
Design the API for optionality. What's the request/response shape, and how do confidence intervals and explainability hooks fit without bloating the contract?
How would you architect the logging and re-tuning loop so accuracy improves over time from real production feedback?