Epoch

Epoch is an event-tech platform: organisers create events, sell tickets, manage check-ins, and run post-event reports. The frontend is Next.js 16 with the app router; the backend is NestJS 11 with Prisma talking to PostgreSQL. Auth is Better-Auth (the open-source replacement for NextAuth / Clerk-style flows that runs in your own infrastructure).

The interesting design choice was the ticket lifecycle as a state machine: reserved → paid → issued → checked-in → redeemed (or any of the back-transitions on cancel / refund). The state machine is enforced in a single NestJS module and the rest of the app talks to it, so double-booking a seat or issuing a ticket that was never paid for is impossible by construction.

The check-in flow is offline-first: the door staff’s device queues scans locally and reconciles on reconnect, so a flaky venue Wi-Fi network does not block the line.

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