DeepOffer

Design guardrails for a consumer-facing assistant: input filters, output filters, or both?

ML System DesignReported interview question
Reported in public interview compilations — Sierra, Character.AI

Combine fast deterministic rules with learned risk scores and a review path. Optimize at the operating capacity, use time-based backtests and adversarial slices, log decisions, and support rapid rule or model rollback.

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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