An / switching/routing developer designs, implements, and troubleshoots networking protocols at the data link () and network () layers. They work predominantly with switches and routers, ensuring smooth data transmission across networks. Their responsibilities include developing software for networking devices, testing and debugging network issues, improving network performance, and sometimes providing technical support. They need a deep understanding of network protocols such as IP, ARP, ICMP, BGP, OSPF, VLAN, STP, and MPLS. They collaborate with network architects and engineers to design scalable network solutions and often need proficiency in programming languages like C or C++.