Salary: £99,000 - 99,000 per year Requirements: Strong IMS architecture knowledge (SIP, Diameter, VoLTE call flows) Hands-on troubleshooting experience (Wireshark, traces) Experience with LTE/5G Core integration Proficient in Linux/Unix; Scripting (Python/Shell preferred) Preferred experience with vendors like Ericsson, Nokia, Huawei Exposure to UK operators such as Vodafone or BT Group Knowledge of NFV/Cloud (OpenStack/Kubernetes) Responsibilities: Manage and support IMS nodes (CSCF, HSS/UDM, SBC, TAS) Troubleshoot SIP/Diameter call flows and perform root cause analysis (RCA) Support VoLTE/VoWiFi service delivery and optimization Handle L2/L3 incidents and ensure SLA adherence Lead upgrades, integrations, and new service rollouts Collaborate with RAN, Core, and vendor teams Technologies: Cloud Support Kubernetes Linux OpenStack Python Unix DevOps More: We are seeking an IMS Engineer to join our team in Reading on a hybrid basis. In this role, you will be responsible for the design, integration, and support of IMS core networks enabling VoLTE/VoWiFi services. We value high availability and service performance and look forward to having you contribute to our mission. last updated 15 week of 2026