A Battery Management Systems (BMS) developer designs, tests, and implements systems that manage and protect battery packs. They are responsible for ensuring optimal performance and longevity of the battery, while ensuring safety standards are met. This involves creating algorithms for state-of-charge (SOC), state-of-health (SOH), and state-of-function (SOF) estimation. They also ensure proper charging and discharging processes, thermal management, and fault detection. BMS developers work closely with hardware and software engineers, often needing knowledge of embedded systems, electronics, and programming languages. They may also collaborate with other teams to integrate the BMS into larger systems.