Robin Kelmen

Solo founder shipping software where getting the number right matters — billing, payroll, tax data. Every value traces back to where it came from.

Builds with natural language, not hand-written code — 6 years directing that process into production software.

Work

Compliance Ledger live · compliance.kelmen.space

A data layer for compliance numbers that defend themselves. Every value links to its source URL, verbatim quote, and the human who signed it.

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LumenBill live · lumenbill.app

Two-sided billing for freelancers and the people who pay them. Money is the object. Both sides see the same truth.

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Numbaroll live · numbaroll.com

Household payroll for families with a nanny or caregiver — pay stubs, tax withholding, and year-end forms with every number cited.

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Specimen in build

A canvas app for thinking. Three modes — quick sketch, start project, open existing. Still cooking — needs polish and BYO-API-key support across LLM providers before it ships.
Present in build

You place a point. The color remembers where you were. A reflection app — still in build, no live landing yet.
Video-in-a-code experiments live · research demo

Research demos: a 60-second video packed into one scannable color code, and a 10-minute film that plays from 130 chained QR codes. Not products — proofs that the idea holds.

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Feedy live · widget

Real apps grow faster than any solo dev can test. Users know what's broken before the team does. Feedy is a drop-in widget that turns their feedback into structured GitHub issues — for human or agentic review, ready to ship. The ghost on this card is one — click it.