Multi-Sport Betting System Development

I'm looking for a capable developer to design a versatile sports betting system for me. This system needs to encompass different types of sports like Football, Basketball, and Tennis as well. Not only should the system be fully functional on both web and mobile platforms, it should support the accumulator bet feature.

Ideal Skills and Experience:
- Experience in developing sports betting systems
- Proficient in mobile and web application development
- Understanding of accumulator betting features

Responsibilities:
- Design a sports betting system to include Football, Basketball, and Tennis
- Ensure the system functions seamlessly on both web and mobile platforms
- Implement the accumulator bet feature within the system
- Test system functionality and fix bugs