Telecoms Core Network Engineer

We are looking for an experienced Telecoms Core Network Engineer to provide, maintain and evolve the core lab environment that underpins advanced security research. You will bring deep technical knowledge of mobile core 4G and 5G network functions, host architectures, virtualised environments and test tooling, and use that expertise to support supplier design reviews, integration, acceptance, testing, maintenance and operations.

This is a hands-on technical leadership role at the heart of UKTL's lab capability. You will act as a design authority for core network systems, hosts and test tools, ensuring the environment is secure, reliable, well documented and ready to support vulnerability research, penetration testing and evaluation activity. You will work closely with suppliers, research teams, evaluation teams and security testing specialists to introduce new components, influence supplier roadmaps, resolve complex technical issues and continuously improve the lab environment as telecoms technology evolves.

• Design, develop, integrate and maintain 4G/5G core network systems, host environments and test tools.
• Act as the design authority for lab systems, ensuring solutions are secure, resilient and fit for research and evaluation needs.
• Own functional testing, fault-finding, troubleshooting and resolution across complex lab environments.
• Support supplier design reviews, integration, acceptance, testing, maintenance and operational activities.
• Work with suppliers to influence technical roadmaps and evaluate new components for future lab evolution.
• Maintain the lab security posture, including reviewing and approving third-party exports where required.
• Support vulnerability research, penetration testing and evaluation teams by advising on required features and activating or deactivating capabilities as needed.
• Set documentation, quality and delivery standards, ensuring activity is planned, recorded and updated using appropriate delivery tools.
• Lead or supervise small teams and cross-functional projects, coaching less experienced colleagues and providing technical direction.
• Identify and implement continuous improvement opportunities across systems, processes and ways of working.

We are looking for someone with strong technical credibility, a collaborative mindset and the ability to explain complex decisions clearly to technical and non-technical audiences. You will understand how your work supports wider organisational and government objectives and be motivated by the opportunity to contribute to national telecoms security.

• Expert technical knowledge of 4G core functions, including MME, SGW, PGW, PCRF, HSS and IMS.
• Expert technical knowledge of 5G core functions, including AMF, SMF, UPF, NRF, PCF, SEPP, NEF, NSSF, AUSF, UDM and UDR, as well as service-based architectures.
• Expert knowledge of building and managing Kubernetes container environments and Open Stack-based hypervisors.
• Strong troubleshooting and fault-finding methodology across complex telecoms, host and virtualised environments.
• Experience of functional testing, analysis and reporting on technical, policy and security implications.
• Ability to break down planned activities into sprint deliverables and keep plans updated, particularly during and before sprint close.
• Experience leading small teams, projects or cross-functional technical activities.
• Clear written and verbal communication skills, including the ability to explain how decisions or conclusions have been reached.

• Familiarity with Radio Access Network architectures.
• Experience or awareness of security testing techniques.
• Interest in industry developments and their implications for government policy, telecoms resilience and cyber security.

Successful applicants will be expected to attend our Birmingham office a minimum of two days per week. Our state-of-the-art facilities provide an excellent environment for collaboration, and we encourage colleagues to make the most of our on-site workspace.

We are committed to fostering a positive work-life balance and welcome applications from candidates seeking full-time, part-time, or flexible working arrangements, subject to business needs.

Our site is conveniently located within easy reach of Birmingham, with excellent transport links. We are accessible by rail, with the nearest being Birmingham International station, and are also served by local bus routes. Free…