Senior Software Developer

Ofgem; Greater London; Hybrid; GBP 50,000 - 70,000; Full time

Job summary

Ofgem is seeking a Senior Software Developer in Greater London to build applications supporting the UK's transition to greener energy. You will develop key scheme applications, mentor junior colleagues, and work within a collaborative digital team that prioritizes innovation and professional growth.

This permanent role requires expertise in C#, Entity Framework Core, SQL Server, and Microsoft Azure. You will play a vital role in ensuring software is high quality and adheres to best practices, contributing to the significant goal of supporting renewable energy initiatives.

Qualifications

• Significant experience developing data-driven web applications using Microsoft technologies.
• Strong cloud and microservices knowledge.
• Experience in modern software design principles.

Responsibilities

• Develop, maintain, and support key Ofgem scheme applications.
• Create and maintain technical documentation for business applications.
• Support the Technical Lead in technical decisions and team leadership.
• Mentor junior colleagues.

Skills

C#

Entity Framework Core

SQL Server

Microsoft Azure

Cloud technologies

Microservices

Docker

Kubernetes

Software design principles

Job description

Successful candidates may be based in any of our office locations – Cardiff, Glasgow or London. We especially welcome applicants from Cardiff and Glasgow.

Job Summary

Technology plays a vital role in supporting the schemes that are helping drive the UK’s transition to greener energy, and at Ofgem, we’re seeking a Senior Software Developer to help build and evolve the applications that underpin this work.

Ofgem is Great Britain’s independent energy regulator. We’re at the forefront of change across the sector, driving toward Net Zero whilst protecting consumers, especially vulnerable people.

We’re offering a permanent opportunity within our Digital Development team where you’ll play a vital role in the development and upkeep of digital services that support major green energy and social schemes operating across the energy sector.

You’ll have the chance to work on meaningful digital products that directly support renewable energy and wider consumer‑focused initiatives, helping shape how applications are developed, improved and maintained across the division.

Alongside mentoring junior colleagues, you’ll work with a range of talented developers, technical leads and multidisciplinary colleagues within our supportive and highly collaborative environment.

You’ll bring significant experience developing data‑driven web applications using Microsoft technologies, including C#, Entity Framework Core, SQL Server and Microsoft Azure. Alongside strong cloud and microservices knowledge, you’ll have experience applying modern software design principles, supporting scalable application development and contributing to high‑quality engineering practices. Strong communication skills and the ability to support and guide others within a collaborative team environment will also be essential.

In return, you’ll have the opportunity to contribute to digital services that support major renewable energy and social schemes across the UK, applying your expertise to work that is both meaningful and technically engaging. You’ll join a forward‑looking environment where innovation, collaboration and development are actively encouraged.

We have a critical purpose to ensure the systems and digital services supporting renewable energy and social schemes remain effective, secure and fit for the future. Join us and help build the applications that support that mission.

Read on and find out more.

Key Responsibilities

• Develop, maintain, and support key Ofgem scheme applications.
• Create and maintain technical documentation for business applications.
• Support the Technical Lead in technical decisions and team leadership.
• Mentor junior colleagues to foster their professional development.
• Manage workloads and prioritize tasks as Work Manager when needed.
• Suggest and implement improvements to the development process.
• Collaborate with cross‑functional teams to deliver user‑centric solutions.
• Ensure adherence to Government Digital Service (GDS) standards.

Key Outputs and Deliverables

• Ensuring that products developed internally and externally are technically and functionally suitable for Ofgem.
• Develop high quality, secure software as part of a team.
• Contribute to, and advance ideas for continuous improvement.
• Champion best practices in Software Development.
• Significant demonstrable knowledge and experience in developing data‑driven web applications using Microsoft technologies, including proficiency in C# for creating robust and scalable web applications, expertise in using Entity Framework Core for efficient data access and manipulation, strong experience in designing, querying, and managing databases with SQL Server, and proficiency in deploying, managing, and scaling applications on Microsoft Azure. (Lead Criteria)
• Excellent communication and interpersonal skills, with the ability to effectively communicate with team members, stakeholders, and clients. Comfortable deputizing for the Technical Lead when required, with the ability to step into a leadership role, manage teams, and ensure project delivery in the absence of the Technical Lead. (Lead Criteria)
• Knowledge and experience in applying common design patterns to solve software design problems, proficiency in writing and executing unit tests to ensure code quality and reliability, and a strong understanding and application of SOLID principles to create maintainable and scalable software.
• Demonstrable experience with cloud technologies, including designing, developing, and deploying microservices‑based architectures, proficiency in using containerization technologies such as Docker and Kubernetes, and broad knowledge of cloud services and platforms with a focus on scalability, security, and performance.
• Ability to guide, mentor, and support junior team members in their professional development, fostering a collaborative and growth‑oriented environment within the team.