The senior-MLOps question that exposes dashboard-driven candidates: your accuracy chart is blind for 60 days, or forever. The layered substitute, proxy metrics, score-distribution sentinels, delayed-label backfill, and paid-for labels, and which layer to trust when they disagree.
Updated Aug 2026 · Grounded in real Forward Deployed Engineer interview loops and written to a senior-engineer editorial bar.
The senior-MLOps question that exposes dashboard-driven candidates: your accuracy chart is blind for 60 days, or forever. The layered substitute, proxy metrics, score-distribution sentinels, delayed-label backfill, and paid-for labels, and which layer to trust when they disagree.
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