Our Client are a leading communications brand with an outstanding reputation for customer service and value commitment. An opportunity has now arisen within their team for an experienced Mobile Packet Core Engineer. Here the Mobile Packet Core Engineer will: * Ensure the reliable operation, maintenance, and evolution of the Mobile Core network, including CS, EPC, IMS, and associated platforms * Deliver high availability and performance for Packet Switched (PS) and Circuit Switched (CS) services, supporting technologies such as VoLTE, and 5G Core * Act as a subject matter expert for 2G, 4G and 5G Packet Core nodes and based services (SGSN, GGSN, MME, SGW, PGW, AMF, UPF and SMF), providing technical support for integration, troubleshooting, and optimization * Support on-net and international NB-IOT, CAT-M and IoT growth with platform and customer support * Operate and maintain EPC, IMS and CS components, ensuring compliance with KPIs and SLAs * Monitor, perform configuration, upgrades, and patches for core network elements (MME, SGW, PGW, PCRF, HSS, SBC, CS Core and IMS nodes) working with Ericsson and other in-house engineers * Monitor and analyse performance metrics to optimize capacity and quality of service * Troubleshoot complex issues across signalling protocols (Diameter, SIP, SS7, GTP, HTTPs) and resolve faults promptly * Manage IP connectivity for GRX and interconnect partners * Support roaming services and ensure IREG compliance * Maintain mobile support services such as SMS, antifraud, voicemail, and SIM steering.VAS and IoT * Support existing VAS SMS, Voice, Signalling solutions * Support the development and in life support of new products and services * Support on-net and international VAS and IoT growth with:othe integration of new platforms and tools The ideal candidate for the role of Mobile Packet Core Engineer will have: * Strong understanding of 2G, 4G and 5G mobile networking and associated core.Strong understanding of protocols utilised in a mobile network including but not limited to SIP, Diameter, SS7 and HTTPs * Experience with mobile core nodes (MME, SGW, PGW, PCRF, HSS, AMF, UPF and SMF) and IMS components (SBC,, S-CSCF, I-CSCF BGCF etc) * Knowledge of IP networks, routers, switches, firewalls, dynamic routing protocols and an appreciation of system security * An understanding and skills to configure and administer a telecoms virtualised environment * Good communication skills both written and verbal * Willingness to work and communicate with both internal cross departmental teams as well as external customers * Flexible approach to work and participation in a callout rota * Desire to learn new technologies through both formal and self-learning and ability to adapt to an ever-changing technical environment * Willingness to explore and create AI and automated tools to aid the team with support of the mobile network nodes and customer faults