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Tablekeeper Factory is our Dark Factory entry on the Tablekeeper track: a restaurant reservation service with one hard guarantee — it never double-books. The system handles single tables and declared combinable pairs, policy-driven pricing, capacity, and opening hours, plus recurring reservation series with clock-time amendments. Its centerpiece is a manager replan solver: when a table closes, it computes the provably optimal reseating by minimizing moved bookings first, then wasted seats, then the table-rank order. Every operation is timezone-correct (local wall-clock, never UTC-shifted), idempotent with exact-replay semantics, and atomic — failed operations change nothing. It was built the way the event intends: by a band of three coding-agent seats (Architect, Builder, Checker) with generic mandates, working in a BAND Desktop room, with every commit gated against the official track harness before the next task. Final scores: stage 1 at 116/120, stages 2, 3, and 4 fully green. Each stage is a complete service that builds clean and serves from a container with no outbound network. The public repo holds all four stages, the seat mandates, the factory description, the full room export, and the walkthrough video.

🌎 Online Hackathon | 💻 Online Build: Sept 26 - Oct 5, 2026 A virtual, global hackathon. Build from anywhere in the world. Dark Factory is the official hackathon of WeAreDevelopers World Congress North America, presented by BAND, but you don't need to be in San Jose to take part. For one week, you build a software factory in BAND Desktop: a band of coding agents that plans work, implements it and checks its own results. 🎟️ Bonus for sign-ups: you are eligible for a free ticket to WeAreDevelopers World Congress North America in San Jose (Sep 23–25). If you do go, stop by the BAND booth: a surprise is waiting for you.