A Cisco Packet Tracer developer designs, develops, and maintains network simulation software. They create virtual networks to simulate real-time network operations, using Cisco's Packet Tracer tool. Their work involves designing network architectures, troubleshooting network issues, and testing network performance. They also create scenarios to test the functionality of routers, switches, and other networking devices. The developer often trains individuals in networking concepts using the tool. This role requires a strong understanding of network protocols, Cisco devices, and programming languages. They also need problem-solving skills to identify and resolve network issues within the simulated environment.