An MFC Developer utilizes Microsoft Foundation Class (MFC) Library, a set of C++ classes, to create Windows desktop applications. Their primary responsibility is to design, build, and maintain efficient, reusable, and reliable C++ code using MFC. This includes developing software solutions by studying requirements, system flow, data usage, and work processes. They also investigate problem areas and follow the software development lifecycle. Their role also involves documenting and maintaining software functionality, updating and improving existing software, and coordinating with team members to ensure project success. They may also be responsible for user interface design.