Betting Site Backend Development

I'm looking for an experienced developer to build the backend for my betting site. The frontend is already completed.

Key Requirements:
- Robust and secure backend development
- Integration with existing frontend
- Real-time data processing capabilities preferred
- Experience with betting or financial applications is a plus

Ideal Skills:
- Proficiency in backend languages (Node.js, Python, Ruby, etc.)
- Strong knowledge of database systems (MySQL, PostgreSQL, MongoDB)
- Experience with real-time data processing
- Familiarity with user authentication and payment processing systems

Please provide examples of similar projects you have completed.