As a Senior Test Development Engineer, you will be responsible for developing and deploying automated test equipment and tools for mass production, engineering validation, and supplier testing of wearable technology. You will collaborate with cross-functional teams, including Manufacturing, Electrical, Firmware, Mechanical, and Sensor Intelligence, to ensure robust and efficient test solutions. Your responsibilities will include defining test strategies, designing and developing electrical and control systems for Automated Test Equipment (ATE), creating and maintaining manufacturing test procedures, collaborating with internal engineering teams and external factory partners, performing root cause analysis, and coordinating contingency plans. The role involves working in a dynamic environment focused on improving test coverage, optimizing fixtures, and driving yield improvements.