Windows Game Engine Development using C#

I'm in need of an expert in software engineering, particularly in the realm of Windows game engine development using C#. The project requires the implementation of a robust physics engine into the game engine.

Key Requirements:
- Proficient in C# programming for Windows platform
- Demonstrable experience in game engine development
- Strong understanding of software engineering principles

The main focus will be on integrating a physics engine into the existing framework of the game engine. If you have experience in creating 2D or 3D physics engines, that would be a huge plus.

It is important that you are able to work independently and are self-driven, as the project will involve a lot of individual problem solving and innovation. Experience with multiplayer capabilities would be an added advantage, but not a necessity for this particular project.