01 · Case study
An agentic QA system that reviews data changes before they ship
I designed and shipped a five-dimension quality review that runs against proposed data changes: deterministic Python owns everything with a testable correct answer, bounded LLM workers own only the judgement calls, and every result is advisory because a human reviewer owns the merge decision.
- Review: 1+ day → under 1 hour
- Running in production
- Same evidence, any analyst
- Python
- LLM agents
- Pydantic contracts
- Snowflake (read-only)



