A MAC (Media Access Control) layer developer designs, implements, and troubleshoots the MAC layer of a network protocol stack. They work on algorithms for efficient data communication, ensuring seamless transmission between network nodes. They deal with issues like frame synchronization, error control, and flow control. The developer also collaborates on the design of physical layer protocols. They may be involved in developing specifications and conducting performance analysis. Their work contributes to the optimization of network efficiency and reliability, impacting areas such as wireless communication, IoT devices, and more. They need a strong understanding of communication protocols and networking concepts.