A CadSoft EAGLE developer designs PCBs (Printed Circuit Boards) and creates schematics for electronic devices. They use EAGLE software to develop complex, multi-layered circuit boards, ensuring optimal layout for functionality and manufacturability. They also generate and manage libraries of components, and create custom parts if necessary. Their work involves debugging and testing designs, as well as collaborating with other team members like hardware engineers and manufacturers. They often need to adhere to industry standards and regulations. Additionally, they might provide technical support and training to EAGLE users.