OpenAI Interview: Design a Reliable Chat Product (EXPLAINED)
Hard OpenAI company question — chat product system design with safety stack, eval gates, streaming, and grounding.
TL;DR — Quick Answer
Design: multi-tier model routing (fast default, escalate hard queries), streaming UX, moderation input/output, system instruction hierarchy, optional RAG for knowledge modes, abstention on low confidence, golden eval + online feedback loop, rate limits per user, prompt injection defenses, and incident response for model updates. Emphasize measurement: helpfulness, harm rate, hallucination on factual subset, p95 latency. Roll out model changes via shadow traffic and gradual percentage rollout with automatic rollback on metric regression.
The Interview Question
OpenAI-style interview: Design a reliable consumer chat product. Cover model selection, safety, eval, latency, and hallucination controls.
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