Seventeen months, one committer, and a 26-unit business runs on it.

02The constraint

• ×One committer. Not a team with one lead — one person across three repositories, for the whole seventeen months.
• ×Bookings are money and they arrive through somebody else's system. The engine syncs against OwnerRez, on OwnerRez's webhook contract, in real time.
• ×Reserve-fund decisions are made against five years of actual bank statements, not against a projection somebody typed.
• ×The weather a guest is asking about is the weather at 10,700 ft, on the mountain — not the weather at the nearest airport.

03What I built

1. 01A booking engine synced to OwnerRez: webhook path acknowledged in ~235 ms, a circuit breaker tuned so launch-day booking races cannot trip it, and a FIFO token-bucket throttle.
2. 02Five portals on one data model — reservations, owner, governance, admin and staff, realtor.
3. 03A group-booking wizard: magic-link invites, conflict-safe self-assignment, and fairness-aware auto-assign with simulate, preview and undo.
4. 04Zoom transcripts through a webhook pipeline into Claude, which drafts committee minutes for review and PDF export. Every test runs a deterministic mock at zero token cost.
5. 05A Monte Carlo reserve-fund simulator: 1,000 iterations × 120 months, resampled from five years of actual bank statements, seeded and reproducible.
6. 06A county-scale property-data platform — subdivisions, sales, people, HOA and management-company cross-referencing — with a realtor portal on top of it.
7. 07A live WeatherLink station at 10,700 ft with history and collection crons, a self-service check-in with QR parking-pass verification, and a lobby kiosk with Twilio voice wired to Slack.
8. 08A sweepstakes engine: Colorado-compliant free entry, double-opt-in referrals, and an auditable seeded draw against an immutable entrant snapshot.
9. 0920+ interactive 3D labs, including a Gaussian splat of the actual building, flyable in the browser.

04Elapsed

First commit

March 2025

Counted

August 2026

Elapsed

17 months

05What it produced

It runs the business. Every reservation, every owner statement, every set of minutes and every parking pass moves through software with one committer.

4,878 commits across three repositories: 47% of everything I have ever committed, and roughly 668,000 lines of tracked source.

Six satellites came off it, each with a sheet of its own: RadioBridge, Brettelberg Mobile, Brettelberg Kiosk, Slack Bridge, Brettelberg Architecture Site and HOA Meeting Manager.