A Controller Area Network (CAN) developer designs, implements, and maintains CAN-based communication systems, primarily used in automotive and industrial applications. They work on creating efficient network protocols, ensuring proper data transmission between various microcontrollers in a system. They also debug and rectify any network issues, optimize network performance, and ensure the system's security. Additionally, they may have to collaborate with other developers and engineers to integrate the CAN with other systems. Their role also involves staying updated with the latest advancements in CAN technologies and adhering to industry standards and protocols.