A BOINC developer creates and maintains software for the Berkeley Open Infrastructure for Network Computing (BOINC). Their role involves developing client-server systems that distribute computing tasks across multiple devices. They work on various aspects such as volunteer computing, grid computing, and distributed computing. Their tasks include designing algorithms, coding, debugging, and testing the software to ensure its efficiency and reliability. They also document their work and interact with the BOINC community to understand user needs, troubleshoot issues, and improve the platform's functionality. They contribute to the open-source community by sharing their work and collaborating with other developers.