DeepOffer

Explain what a reranker is, when to use one, and what a cross-encoder costs you.

ML System DesignReported interview question
Reported in public interview compilations — Cohere, Microsoft, Perplexity

Start with workload, users, data, quality metrics, latency, throughput, freshness, reliability, and cost targets. Choose a simple baseline, then separate offline data/training/evaluation from online serving and feedback collection.

Make interfaces and ownership explicit; add versioning, access control, monitoring, canary rollout, rollback, and a plan for delayed labels or human review.

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