Mobile Core Design Professional - Performance & Optimisation

Job Description

Recruiter: Trevor Newman

Career Grade: E

Internal Closing Date: 30/04/2026

About the role

The mobile core design team defines the critical mobile data services that our customers rely on. To achieve this, the team engineers platforms with names known to the industry as AMF, SMF, UPF, PCF, NRF, UDM, UDR and 4G equivalents. This role supports the Senior Manager in optimising aspects of the core such as its performance, dimensioning, resilience and security. To do this requires collaboration with many other people, such as platform design authorities and vendor engineers. The results directly impact customers.

What you’ll be doing

• Supports the development of deep technical and repeatable solutions that achieve customer requirements driving positive outcomes.
• Supports business stakeholders’ understanding of capabilities.
• Supports the translation of requirements into product configuration and implementation.
• Executes work in delivering initiatives that are a part of the company's overall strategy.
• Supports in the implementation of ways to improve working processes within the area of solution architecture.

Essential Skills / Experience

You’ll have the desire and ability to understand how a technical system works underneath, and put this to use in designing new services and platforms to perform optimally.

You can express your thoughts clearly and concisely in writing, without help from AI. When writing you are thoughtful towards the type of audience. Often, to convey a complex technical interaction accurately, drawing diagrams will be necessary.
You’re able to verbally communicate complex issues clearly and concisely, including to non-technical people.
You’ll have a basic understanding of the following technologies, combined with the ability to independently learn more depth in particular areas as and when you need to.

• Evolved Packet Core (EPC)
• 5G Core (5GC)
• Openstack
• Kubernetes
• HTTP, DNS and IPv6
• Data visualisation tools e.g. Grafana

You can use AI to accelerate your work.

Experience you’d be expected to have;
Mandatory
• Experience of at least two of the six bullets in the skills section.
• A technical role where you needed to demonstrate the ability to learn an unfamiliar technology, and were able to do so independently.
Preferred
• Experience of most of the bullets listed in the skills section.

BT Group is the UK’s leading communications group and the holding company behind some of the country’s most recognised brands – including BT, EE, Openreach and Plusnet. Our purpose is as simple as it is ambitious: we connect for good. Our customers include consumers, small, medium and large businesses, public sector organisations and other communications providers.

BT Group’s role is about setting direction, unlocking value and creating the conditions for our brands and businesses to thrive.

Having come through the most capital-intensive phase of our fibre investment, our focus now is on what comes next – simplifying how we operate, using technology and AI to work smarter, and organising ourselves to serve customers better and grow sustainably. Group teams shape strategy, policy, brand, capital allocation and transformation, helping the whole organisation perform at its best.

We have a singular culture that unites all our people: we are customer-first challengers, who are committed, clear and connected. These behaviours unite us as one team to deliver for our colleagues, our customers, our stakeholders and the country. Joining BT Group means working at the heart of a business that matters to the UK, with the opportunity to shape decisions, influence outcomes and help set the future course of one of the country’s most important companies.