Windows Clinic Management Desktop App -- 2

I need a secure and user-friendly desktop application for clinic management, compatible with Windows. The application should have a mix of graphical and command-line interfaces.

Key functionalities:
- Patient records management
- Appointment scheduling
- Billing and invoicing
- API security interface
- Database with backup control
- User management

Ideal skills and experience:
- Proficiency in Windows desktop application development
- Experience with secure API integration
- Strong database management skills
- UI/UX design for mixed interfaces
- Background in healthcare software solutions is a plus