An IP Multimedia Subsystem (IMS) developer designs, develops, and maintains IMS applications. They work on creating and integrating protocols for internet-based multimedia services. They ensure smooth communication between different network interfaces like LTE, , and broadband. Their responsibilities include developing and troubleshooting SIP protocols, understanding Diameter interfaces, and working on VoIP technologies. They also need to understand the standards set by for IMS. They work collaboratively with network engineers and other IT professionals to ensure the quality of multimedia transmission, often troubleshooting and resolving any network or system issues that may arise.