A BackTrack OS developer works on developing and maintaining the BackTrack operating system, a Linux-based distribution used for penetration testing and digital forensics. They implement security tools and protocols, enhance the performance of the system, and fix bugs. They also collaborate with security experts to integrate the latest hacking and security techniques. Their role involves understanding complex coding languages and cybersecurity concepts. They constantly update the OS to ensure it is equipped with the latest security measures. Regular testing and improvement of the system's functionality is also part of their responsibilities.