Our client is seeking a Mobile Voice Core Engineer to ensure the reliable operation, maintenance, and evolution of their Mobile Core network, which includes CS, EPC, IMS, and associated platforms. This full-time position involves 37.5 hours of work each week, with the opportunities available in Guernsey, Jersey, or the Isle of Man. The role reports to the Senior Mobile Engineer and collaborates with Mobile, Fixed, Transmission, and IP teams, as well as the Security Architect and Product teams. In this role, you will deliver high availability and performance for Packet Switched (PS) and Circuit Switched (CS) services, supporting technologies such as VoLTE and 5G Core. As a subject matter expert for IMS-based services, you will provide technical support for integration, troubleshooting, and optimisation. The successful candidate will also play a key role in ensuring that the network meets performance metrics and provides exceptional service quality.
Job Duties:
- Operate and maintain IMS, CS, and EPC components, ensuring compliance with KPIs and SLAs.
- Monitor, perform configuration, upgrades, and patches for Mobile core network elements (MME, SGW, PGW, PCRF, HSS, HLR, SBC, CS Core, and IMS nodes) while collaborating with other engineers.
- Monitor and analyse performance metrics to optimise capacity and quality of service.
- Troubleshoot complex issues across signalling protocols (Diameter, SIP, SS7, HTTPs) and resolve faults promptly.
- Manage IMS platforms and SIP-based services for mobile and fixed voice.
- Support Cloud Voice and FTTH voice solutions, ensuring seamless integration with IMS.
- Implement and maintain Microsoft Teams Operator Connect and related interworking functions.
- Ensure QoS and security compliance for all IMS-based services.
- Support roaming services and ensure compliance with IREG.
- Maintain mobile support services such as SMS antifraud, voicemail, and SIM steering.
- Support the deployment of new SIP carrier interconnects and ongoing support, as well as routing and troubleshooting existing interconnects.
- Monitor, manage, and support upgrades of the Mobile Core Physical, Virtualised, and Containerised infrastructure.
- Participate in network expansion, capacity planning, and software upgrades.
- Work with the Security Architect to review assets, identify weaknesses, and maintain appropriate security levels.
- Investigate security alerts and provide incident response within your domain.
- Comply with relevant licence and regulatory rules, as well as Data Protection Law and Health and Safety responsibilities.
Job Requirements:
- Strong understanding of 2G, 4G, and 5G mobile networking and associated core technologies.
- Proficiency with protocols utilised in a mobile network, including SIP, Diameter, and SS7.
- Experience with mobile core nodes (MME, SGW, PGW, PCRF, HSS) and IMS components (SBC, S-CSCF, I-CSCF, BGCF, etc.).
- Knowledge of IP networks, routers, switches, and dynamic routing protocols, along with an appreciation for system security.
- Skills to configure and administer a telecoms virtualised and containerised environment.
- Excellent communication skills, both written and verbal.
- A flexible approach to work and willingness to participate in a callout rota.
- An eagerness to learn new technologies through both formal and self-learning, with the ability to adapt to an ever-changing technical environment.
What You’ll Love:
Our client fosters a culture that prioritises teamwork, customer satisfaction, reliability, and a passion for technology and learning. They are committed to community and sustainability, making it a great environment for professionals seeking to make a difference. You will have the opportunity to work in a dynamic setting where your contributions are valued, and your professional development is supported. If you are someone who thrives on new challenges and is eager to enhance your skill set while delivering impactful solutions, this role could be your next great move.
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