Overview
Mobile Core Design Specialist - Signalling and Roaming. Posting Date: 13 Mar 2026. Unit: Networks. Location: 1 Braham Street, London, United Kingdom. Locations: Bristol or London. Working Style: 3 days a week in office, 2 from anywhere.
The role sits within the Signalling and Roaming Design Team, which is part of the Mobile Core Design department within the Mobile directorate of Networks. This is a major enabling Directorate within Technology, with responsibility for network design, capacity planning, strategy decisions, site and infrastructure.
The Signalling and Roaming Design Team has responsibility for signalling functions in the core network, including STP, DSR, SCP, NRF, Signalling Firewall systems which are key components in providing Voice, Data and Value Added services including 4G, 5G, WiFi, and International roaming and their associated network management systems.
You will be part of that picture, acting as a design lead to analyse and make decisions, closely working with other teams within Networks and Mobile Core Design, to design and deliver solutions within the Mobile signalling core, thus enabling services for customers of EE, BT, and multiple other brands. The team has built the best performing network in the UK since 2013 and was first to launch both 4G and 5G.
What you’ll be doing
* Deliver deep technical and repeatable Signalling Design solutions that achieve customer requirements driving positive outcomes.
* Guide partnerships with business and operational stakeholders to ensure successful transition from Design through Delivery and to Operational Acceptance.
* Implement robust recommendations, proposals and scope of work documents (including creating and maintaining robust Design documentation) for group engagements while identifying critical dependencies and gaps.
* Contribute to thought leadership and provide advice on a specific set of technologies to help senior leadership shape long-term solution architecture strategies.
* Deliver complex, strategic initiatives that are part of the company’s overall commercial Strategy.
* Champion ongoing development as a domain expert and share knowledge on emerging trends and changes in solution architecture.
What you’ll bring
* 10% on target bonus
* Life Assurance Cover
* Exclusive colleague discounts on BT broadband, BT TV with TNT Sports and NOW Entertainment
* From January 2025, equal family leave: 18 weeks full pay, 8 weeks half pay, 26 weeks statutory rate
* Enhanced women’s health support including menopause symptoms, cancer screenings, period care and more
* 25 days annual leave (not including bank holidays), increasing with service
* 24/7 private virtual GP appointments for UK colleagues
* 2 weeks carer’s leave
* World-class training and development opportunities
* Option to join BT Shares Saving schemes
* EE Broadband – from £10/month for 150Mb and £20 for 900Mb
* EE Mobile – Save 50% on Mobile & SIM-only plans or £10/month for an EE SIM
* EE TV – Premium content like Netflix and TNT Sports, from £10/month
* Combine Broadband, TV, and Mobile from £30/month with extra savings when taking Broadband and Mobile
What you’ll bring (Skills/Experience)
Mandatory
* Solution Architecture: Strong track record of designing and planning mobile core network solutions in the role of a designer or planner of business-critical, high-availability / high-throughput systems and networks
* Solution Design: Excellent knowledge and experience of Mobile Core Network elements and protocols in areas including Signalling nodes (STP, Diameter DRA, SIP Session routers, 5G SBA SCP/SEPP); design or planning of Signalling and voice interconnects, MVNO networks and services, International roaming, and other value-added services
* Product Roadmapping: Experience with supplier and third-party relationships, product/feature selection, and delivering products into production
* Requirements Gathering: Ability to analyse requirements and clearly document and articulate recommended solutions
* Technology Deployment: Ability to manage interfaces with Network Control, Delivery, Project, Security and Operational teams to ensure successful transition from Design to Delivery and Operational Acceptance
* Performance Monitoring: Experience of producing network traffic and system reports, and contributing to domain reporting
Nice to have
* Cloud Computing: Knowledge and experience of design and deployment of Mobile signalling solutions in Cloud environments
* Member of a professional body e.g. Institute of Engineering and Technology
* Degree in a relevant engineering discipline would be useful
About us
BT Group was the world’s first telco and our heritage in the sector is unrivalled. We are transforming our business and investing in digital infrastructure, AI, and technology to create the UK’s best telco. We welcome flexible working arrangements and reasonable adjustments for the selection process.
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