Job Title: IMS Engineer

Location:Reading (Hybrid)

Role Overview

Responsible for design, integration, and support of IMS core networks enabling VoLTE/VoWiFi services, ensuring high availability and service performance.

Key Responsibilities

• Manage and support IMS nodes (CSCF, HSS/UDM, SBC, TAS)
• Troubleshoot SIP/Diameter call flows and perform 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

Required Skills

• Strong IMS architecture knowledge (SIP, Diameter, VoLTE call flows)
• Hands-on troubleshooting (Wireshark, traces)
• Experience with LTE/5G Core integration xbpsjku
• 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)