A CANBus developer designs, develops, and implements Control Area Network (CAN) bus systems, a vehicle bus standard, primarily for automotive applications. They work with embedded systems and microcontrollers to facilitate communication between various devices in a vehicle without a host computer. They design software to decode CAN messages and troubleshoot network communications. This includes monitoring and testing the system for faults, improving network performance, and ensuring the security of the network. They also work with other engineers to integrate the CAN bus system into the overall vehicle design. Their role is crucial in modern vehicle design and operation.