Software Engineering Specialist - Erlang

BT Group; Greater London; On-site; GBP 85,000 - 120,000; Full time

Benefits offered by this job

Bonus 10%

BT Pension

Extended family leave

25 days annual leave

Training & development

BT Shares

Discounted BT packages

Job summary

BT Group is seeking a Software Engineering Specialist specializing in Erlang in London. You will design, develop and deliver high‑quality software solutions that improve speed, resilience and efficiency across telecoms services.

The role focuses on architecture, APIs, and scalable systems within a dynamic Mobile Software, Data and AI team. The position requires strong Erlang and Python skills, extensive experience in microservices and cloud-native architectures, and a passion for operational

Qualifications

• Strong proficiency in Erlang, Python with demonstrated experience in building robust systems or applications.
• Extensive background in software architecture with microservices, distributed systems, and cloud-native architectures.
• Deep understanding of design principles, patterns, TDD and version control.

Responsibilities

• Delivers the engineering strategy to ensure on-time, on-budget delivery with measurable capabilities.
• Makes complex technical decisions and architecture for high-performance products and platforms.
• Resolves strategic issues with advanced technical knowledge and develops complex solutions.
• Drives the technical roadmap to meet business and partner needs.
• Champions engineering excellence with metrics and continuous improvement.
• Writes, tests and reviews code and communicates with engineers across the project.

Skills

Erlang

Python

Software architecture

Microservices

Distributed systems

Cloud-native

Design patterns

Test-driven development

Git

APIs

Tools

Git

Job description

Job Title: Software Engineering Specialist - Erlang

Req ID: 62562

Job Function: Software Engineering

Posting Start Date: 15/09/2026

Posting End Date: 24/09/2026

Division: Networks

Job Location: GBR-London-BTHQ One Braham

Advertised Salary: Competitive with great benefits

Career Grade: CLD

About the role

As networks grow in complexity and the demand for speed, resilience, and efficiency increases, our need to intelligently leverage software engineering becomes critical. This role sits at the heart of that transformation. You’ll be enabling a real shift in how telcos operate and serve customers in designing and developing software solutions that streamline workflows, embed compliance, and eliminate inefficiencies. Your work will directly impact how quickly and reliably services are delivered that benefit customers, how easily teams can operate and troubleshoot systems, and how effectively the business can adapt to new technologies and opportunities. This isn’t just about writing code or developing software solutions, it’s about shaping the future of operational excellence in the Software, Data and AI team in Mobile.

What you’ll be doing

• Delivers the engineering strategy in ensuring the engineering organisation’s ability to deliver high quality on time and on budget and implementing means of bringing measurability as well as predictability to the engineering organisation’s capabilities
• Executes complex technical decisions, technology choices and architecture for a wide range of high-performance products, capabilities, and platforms, effectively balancing short-term impact with long-term transformation
• Resolves complex and strategic issues using advanced technical knowledge, across wider industry and/or specific sectors, and develops bespoke or leading edge, technically complex solutions (e.g., relating to new, un-tested technology and/or large-scale impact of products)
• Executes and contributes to the development of the ambitious and compelling technical roadmap to meet the needs of the business, engineering team, and partner teams
• Executes engineering and operational excellence initiatives, implementing metrics and process for regular assessment and improvement
• Drives an engineering culture that fosters innovation and creativity while delivering high quality products with predictability and reliability
• Writes, tests and reviews code, refining and rewriting as necessary independently and communicates to engineering professionals and colleagues involved in the project
• Solves complex and escalated aspects of a project, performing coding, debugging, testing and troubleshooting when necessary
• Plays a positive contributor role in the software engineering organisation, implementing the technical vision and the pursuit of innovations regarding new technologies, platforms and applications.
• Evaluates, implements and maintains high-quality tools and complex automation processes to support continuous delivery and developer productivity

Essential Skills / Experience

• Strong proficiency in Erlang, Python with demonstrated experience in building robust systems or applications.
• Extensive background in software architecture and solution design, with deep expertise in microservices, distributed systems, and cloud-native architectures.
• Deep understanding of software development principles, including design patterns, modular architecture test-driven development (TDD), and version control (e.g. Git).
• Comfortable with Spec-Driven-Development (SDD) and other AI supported software practices.
• Experience integrating with APIs, network systems, or telemetry platforms, ideally in telecoms or other operational environments.
• Strong commercial experience developing production-grade software using Erlang and the Erlang/OTP ecosystem.
• Experience working with telecommunications protocols including HTTP/HTTP2, Diameter, MAP, SIP, and SNMP, with a strong understanding of signalling, messaging flows, network integration, and troubleshooting within carrier-grade environments.
• Experience developing and maintaining web-based applications and services using modern web technologies, including RESTful APIs, front-end frameworks, and back-end services, with a focus on performance, scalability, and user experience.

Our Package

• 10% on target bonus
• A BT Pension scheme, minimum 5% Employee contribution, BT contribution 10%
• From January 2025, equal family leave: receive 18 weeks at full pay, 8 weeks at half pay and 26 weeks at the statutory rate. It’s for all parents, no matter how your family is made up.
• 25 days annual leave (not including bank holidays), increasing with service
• Huge range of flexible benefits including cycle to work, healthcare, season ticket loan
• World-class training and development opportunities
• Option to join BT Shares Saving schemes.
• Discounted broadband, mobile and TV packages
• Access to 100’s of retail discounts including the BT shop

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.