Upgrade Guidance for C# Windows App

I'm seeking an experienced developer or consultant to provide guidance on upgrading my C# Windows Application ms sql to both web and mobile platforms.

Key areas for consultation:
- Web & Mobile Technologies: Recommending the best technologies for a seamless upgrade.
- Database Setup: Advising on the optimal database configuration, whether a single or multiple databases would be most efficient.
- Upgrading Existing Customers: Strategies for transitioning current users to the upgraded application.
- Developer Management: Ensuring development is conducted without code duplication.

The ideal candidate would have:
- Extensive experience with C# Windows Applications.
- In-depth knowledge of web and mobile technologies.
- Proven track record in database management and setup.
- Excellent communication skills for effective developer management.