Windows Desktop Billing App Development for retail Business

I'm seeking a developer to create a standalone desktop billing application for retails business for Windows. The primary function of this application will be generating standard invoices.

Key requirements:
- The application should have a user-friendly interface.
- It should be compatible with Windows OS.
- Customer Data base, Credit points, Reports generation

Ideal candidates would have:
- Proven experience in desktop application development, specifically for Windows.
- A strong background in creating billing or invoicing software.
- Excellent UI/UX design skills.