Selected work
Tickets
Event ticketing with reserved checkout, QR tickets, and live seat inventory. Public catalog, customer tickets, and an organizer dashboard with a gate scanner.
TanStack Start · NestJS · PostgreSQL · Socket.IO · AWS
Problem
Event organizers need a catalog, reserved checkout that does not double-sell a seat, QR tickets at the gate, and a live view of what is left. A brochure site cannot do that.
Role
Solo builder. TanStack Start frontend, NestJS API, PostgreSQL, Socket.IO inventory. The architecture runs on AWS.
Constraints
Payments are mocked. A real processor comes later. Inventory still has to stay correct when two people checkout at once.
Decisions
Reserve, then pay
An order holds seats in PostgreSQL with a TTL. If payment never lands, the hold expires and the seats go back.
Live inventory over Socket.IO
The catalog does not poll. The API pushes ticket updates so two people looking at the same event see the same remaining count.
A typed API on the other side
Zod validates every response. Auth is JWT with refresh. Admin and customer routes use separate guards.
Host it on AWS
The API sits on AWS behind a load balancer. PostgreSQL and S3 live on the same footprint. Event banners go to S3.
Outcome
A platform you can run locally: public events, reserved checkout, QR tickets, organizer dashboard, and a gate scanner. The frontend and API repos are public. There is no production URL yet.