Software Engineer - Network Modelling & Optimisation

Flexible 3 days a week together out of our Ipswich site (flexible 2 days remote wherever).About the role

This role sits at the heart of how we plan and evolve the UK’s core network – the infrastructure that keeps people, businesses and critical services connected every day.

Today, powerful modelling and optimisation tools help shape decisions across our network, but they’re largely accessed through specialist teams. We’re now transforming that approach — moving to a modern, cloud-based platform that makes these tools more accessible, scalable and impactful across the wider organisation.

As a Software Engineering Specialist, you’ll play a key role in that transformation. You’ll help modernise how network modelling is delivered, enabling teams to move faster, make better decisions, and focus on higher-value, forward-looking work.

This is an opportunity to combine software engineering with real-world impact — contributing to decisions that shape national-scale infrastructure.

What you’ll be doing

Designing and building a web-based application that brings network modelling and optimisation tools into a modern, accessible platform

Transforming existing desktop-based tools into scalable, cloud-hosted solutions used across Fixed Networks Setting up and maintaining cloud infrastructure, including virtual machines, databases and secure environments

Developing APIs, data pipelines and integrations to bring together multiple data sources into a single modelling environment

Embedding secure-by-design principles, including identity access management and single sign-on for sensitive data Improving code quality, automation and deployment pipelines to support reliable, scalable delivery

Enhancing and evolving existing modelling tools as they are migrated — enabling richer capability, improved performance and new use cases

Contributing to future network modelling, simulations and optimisation work as the platform evolves

Essential Skills / Experience Experience building software using Python and JavaScript (e.g. React, NextJS, Type Script).Experience working with on-prem or private cloud environments, including hosting applications across virtual machines and internal platforms (rather than purely public cloud)
Demonstratable commercial background of security best practices, including identity and access management and secure application development

Infrastructure as Code (e.g. Terraform, Ansible).Desirable Skills / Experience Experience building or consuming APIs.Knowledge of containerisation (e.g. Docker, Kubernetes).Ability to design and work with databases (e.g. SQL, schema design)
Strong understanding of modern software engineering practices (e.g. CI/CD, automation, version control, testing)
Interest in algorithms, optimisation, or modelling problems.

Experience modernising or migrating legacy systems to cloud-based architectures.

Our Package Tailored benefits make a real difference. That’s why we offer a comprehensive range to support your growth, wellbeing, and everyday life. You can design the package to suit you and your lifestyle. Your core benefits include: 10% on target annual bonus Access to an online private GP 24/7 for you and your immediate family  Market-leading paid carers leave with up to 2 weeks off  Equalised maternity, paternity, and adoption leave – 18 weeks’ full pay and 8 weeks’ half pay Discounted EE and BT products, including mobile and broadband Market leading Pension scheme – 5% from you and 10% from us Holiday purchase scheme You can select additional benefits, including healthcare, dental, gym memberships and more when you’re ready.

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…