TL;DR

Operations/Systems engineer recently moved to the software side via AI collaboration.

Built a domain-specific entity resolution tool in a handful of evening sessions with Claude Code.

Caught about 99.2% of human-detected reconciliation errors when replayed against 8 weeks of historical data.

Turned a "skilled-veterans-only" weekly task into something anyone on the team can run.

Design retrofitted unexpectedly well to dual process theory, Gestalt psychology, and anchoring-bias defense.

Source business records never reached an LLM. Deterministic pipeline + human review only.

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