60 Days Using Claude Code on a Production ERP: Raw Numbers, No Hype

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A solo developer spent 60 calendar days building a production ERP system called Rembrandt using Anthropic's Claude Code AI assistant, logging 984 commits and generating over 131,000 lines of TypeScript and JavaScript code. The project ran across 58 active days, averaging 16 commits per working day while the developer simultaneously managed accounting, team decisions, and other responsibilities. The codebase includes 276 Supabase migrations, 74 documented architecture decisions, and 18 project rules, with the AI-piloting methodology revised through nine distinct versions over the period. The developer initiated a refund negotiation on a five-figure contract with a commercial ERP vendor whose custom development was billed per line of code produced. The writeup is presented as a candid field audit rather than a success story, filling a gap the author identifies in AI tooling literature dominated by hackathon demos and vendor marketing.

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