Event Ticketing System Development

I need a comprehensive event ticketing system developed for web, iOS, and Android platforms. The system should include:

- Seat Selection: Allow users to choose their seats.
- Payment Processing: Secure and efficient payment handling.
- Ticket Scanning: QR code or barcode scanning for entry.

Ideal skills and experience:
- Experience in developing ticketing systems.
- Proficiency in mobile and web app development.
- Strong background in payment processing integration.
- Familiarity with ticket scanning technology.

Please provide samples of similar work. Looking forward to your bids!