C Application Development for Windows

I'm looking for an experienced C programmer to develop an application-API level program specifically for Windows.

Key Requirements:
- Expertise in C programming
- Experience with Windows OS application development
- Ability to implement algorithms efficiently
- Strong problem-solving skills

Ideal Skills and Experience:
- Proficiency in Windows API
- Background in application-level programming
- Previous project experience in C on Windows platforms

Please share your portfolio and relevant experience.