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Intermediate ~18 hours
🧠 Machine Learning Engineer🤖 AI Engineer

LLM Eval Harness for Regression Testing

Build an evaluation harness that runs on every prompt change — catches regressions before they hit production.

PythonOpenAI / Anthropic SDKpytestGitHub Actions

About this project

Eval harnesses are the #1 missing capability in most AI products. This project teaches how to build one: golden datasets, automatic grading (LLM-as-judge + heuristics), regression alerts, and the CI integration. Build it for a specific task (text classification, structured extraction, summarization) and run it against 3+ models.

Why build this in 2026?

Every team shipping LLM features needs evals. Most teams don't have them. Massive hiring opportunity.

What you'll ship

  • GitHub repo
Golden dataset (50+ examples)
CI workflow that runs evals on PR

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Skills you'll practice

pythonlarge language modelspytorch