An ATM Switches/Routers (Cisco-IOS) developer designs, implements, and troubleshoots communication networks using Cisco's Internetwork Operating System (IOS). They work on Advanced Technology Microwave (ATM) switches and routers to ensure seamless data transmission. Their responsibilities include configuring routing protocols, managing network security, optimizing network performance, and resolving connectivity issues. They also need to understand various networking protocols and services. They may work closely with other network professionals to design and implement large scale networks. Furthermore, they must stay updated with the latest networking trends and technologies, and often provide technical support and guidance.