How would you set up an evaluation framework from scratch for a new LLM application?

'Eval is the new system design' for LLM apps, and starting from zero data is the real test. The signal is bootstrapping a golden set, picking task-specific metrics, and running evals continuously as a regression gate.

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

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Applied AI Engineering·What this job actually isFree15mFive habits from normal software that will hurt you hereThe hardest part of moving into applied AI is not the new material, it is the instincts you already have. Five of them are actively wrong here. This lesson names each one, what replaces it, and why the substitution is not optional.Applied AI Engineering·Prompting as an engineering disciplineFree13mTelling a real improvement from a lucky runMost prompt iteration is superstition: change something, try it once, feel better, ship. This lesson replaces that with the smallest honest process, which takes about an hour to set up and is the highest-return hour in the course.

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