C# Web App Development and Enhancement

I need an experienced developer to enhance and support my C# web app. The project involves adding new features and improving existing functionalities across the board, including database, C# Web API, and jQuery.

Key Areas of Focus:
- New Feature Development: Open to suggestions based on expertise.
- Performance Improvements: Optimize backend logic, data handling, and frontend interface.

Ideal Skills and Experience:
- Proficiency in C# Web API, jQuery, and SQL Server.
- Strong problem-solving skills.
- Experience in performance tuning and feature development for web applications.
- UI/UX design knowledge is a plus.

Please share relevant experience and approaches.