A CANoe developer designs, tests, and validates software for in-vehicle communication systems. They work with the Controller Area Network (CAN) protocol, a standard for transmitting data between automotive components. The developer uses the CANoe development and test software to simulate networks and electronic control units (ECUs), create test cases, and analyze network behavior. They also debug software issues, ensure compliance with automotive standards, and often work with other software such as MATLAB or Simulink. The end goal is to ensure reliable, efficient communication between different parts of a vehicle, contributing to overall vehicle safety and performance.