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Case study · Event ticketing platform
VenueSync
Organizers publish events, attendees buy tickets in two taps, and door staff scan QR codes at entry. Web, Android and backend, built end to end.
- Status
- Live
- Platforms
- Web, Android, API
- Automated tests
- 60+ test classes
- Commits
- 260+
- No double-sold seats. Seat allocation takes a database lock (pessimistic locking on PostgreSQL), so two buyers can never get the same last seat. Purchases are idempotent: a retried request can't charge twice.
- Edits that can't undo each other. Events carry a version number. If an organizer saves on the website and on the phone at the same time, the stale save is refused instead of silently overwriting the other.
- Tickets that work offline. The Android app keeps tickets in an encrypted on-device store, so an attendee can show their QR code at a venue with no signal.
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