Rethink3D Raffle System — missions, tickets and a draw you can audit

The problem

At events, Rethink3D wanted to engage people walking past the booth — and an improvised draw doesn’t convince anyone it was fair.

What I built

API and web, alone, in five weeks (Jul 10 to Aug 15, 2026, 66 commits):

• participants complete missions — photo proof, quizzes, feedback, referrals, surveys — and earn tickets;
• the admin triggers the draw, streamed live to the big screen and to phones;
• participant, admin and public screens, plus a paired booth kiosk.

Decisions

An auditable draw. Each participant’s weight is proportional to their tickets, and every draw writes a log with a snapshot of participants, weights and the result.

A public gateway with limits. The WebSocket accepts up to 1,000 connections, 10 per IP and messages up to 10 KB.

Campaigns as a state machine. Draft → active → drawing → paused → finished, with no shortcuts between states.

By the numbers

• 66 commits in 5 weeks
• 23 Prisma migrations and 15 modules in the API