A Microsoft Windows developer designs, codes, tests and debugs software applications for the Windows operating system. They utilize programming languages like C#, C++, and .NET to create user-friendly applications, ensuring compatibility with existing systems. They might also work on updates and patches for existing applications to improve performance and security. Developers often collaborate with other team members, like UI/UX designers and software testers, to deliver high-quality software. Additionally, they may be involved in gathering user requirements, troubleshooting issues, and maintaining documentation for future reference. They continually learn to keep abreast with the latest technologies and methodologies in Windows development.