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Six months after deployment, the CFO asks: 'What has this model actually earned us?' How do you answer?

Accuracy metrics don't survive contact with a CFO. The holdout pattern that turns a model into a permanent revenue receipt, and what to do when nobody set one up six months ago.

Updated Aug 2026 · Grounded in real Forward Deployed Engineer interview loops and written to a senior-engineer editorial bar.

Accuracy metrics don't survive contact with a CFO. The holdout pattern that turns a model into a permanent revenue receipt, and what to do when nobody set one up six months ago.

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