A MaxMSP developer utilizes the visual programming language MaxMSP to create complex, interactive software for audio, video, and graphical processing. They construct patches, which are software programs created by connecting objects with patch cords in a visual environment. These patches can generate sounds, manipulate existing media, or even control external hardware. Their work is often utilized in interactive installations, live music performances, and multimedia projects. The developer is responsible for understanding the project's requirements, designing, coding, testing, and debugging the software to ensure it meets these needs. This role requires strong programming skills, creativity, and problem-solving abilities.