A Keepalived developer designs, develops, and maintains the Keepalived system, a Linux infrastructure that provides simple and robust facilities for load balancing and high availability. They write and debug code, often in C programming language, to ensure the software's reliability and efficiency. They also handle system issues and provide solutions for any encountered problems. Furthermore, they collaborate with other developers and IT specialists to integrate Keepalived with other systems and to improve its functionality. They may also create documentation and provide user support, ensuring that the system meets the needs of its users and functions optimally.