Subscription-based Desktop App Developer Wanted

I'm in need of an experienced web application developer who can help me create a subscription-based desktop application.

Key Features:
- User Registration and Login: A seamless and secure user registration and login process has to be integrated.
- Payment Processing: The app should support payment processing for subscriptions.
- User Profile Creation: An interactive and engaging user profile creation feature is needed.
- Reward Systems: Incorporation of reward systems to keep users engaged and motivated.
- Sound Effects: There's a need for sound and written alerts when specific triggers breached
- Recommendation System: A recommendation system to suggest relevant content to users would be a huge plus.

The ideal candidate should have:
- Proficiency in desktop application development
- Experience in developing subscription-based platforms
- Knowledge of payment processing integration
- Familiarity with incorporating sound effects in desktop applications
- Proven track record in creating recommendation systems

If you have the right skills and experience for this project, I'd be glad to hear from you.