The staff-level version of 'evals first.' Four layers, each with a job, a cost, and a blind spot, plus judge calibration numbers and the data flywheel that ties production failures back into CI.
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← RAG & Agent System Design / 19
hard★ EssentialOpenAIAnthropicScale
Design the full eval harness for an LLM product: offline goldens, LLM-judge, online A/B, CI gates
The staff-level version of 'evals first.' Four layers, each with a job, a cost, and a blind spot, plus judge calibration numbers and the data flywheel that ties production failures back into CI.
Updated Aug 2026 · Grounded in real Forward Deployed Engineer interview loops and written to a senior-engineer editorial bar.
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