case studyin progress

Budget Engine

A household finance engine where every number traces to a source row: stdlib Python, 181 tests, a Friday email.

pythonsqlitelaunchdemail

year: 2026
check-ins: 1

Build log

Check-ins written while building, most recent first.

Budget EngineThe Budget Engine: trust as an architecture decisionA household finance engine built in five days of commits: stdlib-only Python, every number traceable to a source row, and a decision log that records the wrong turns on purpose.27 Jul

more check-ins land as the build progresses