Application Support Developer

Job Description

Join us, be part of more.

We’re so much more than an energy company. We’re a family of brands revolutionising how we power the planet. We're energisers. One team of 21,000 colleagues that's energising a greener, fairer future by creating an energy system that doesn’t rely on fossil fuels whilst living our powerful commitment to igniting positive change in our communities. Here, you can find more purpose, more passion, and more potential. That’s why working here is #MoreThanACareer. We do energy differently - we do it all. We make it, store it, move it, sell it, and mend it.

About your team:

At British Gas, our mission is to sell it and mend it.

We’ve been powering the UK’s homes and businesses for over 200 years – but supplying energy is just part of what we do. We’re making the UK greener and more energy efficient, getting closer to Net Zero. By using clever tech like thermostats, heat pumps, solar panels and EV chargers, we’re making it cheaper and easier for our customers to reduce their carbon-footprint.

Role: Application Support Developer (.NET / C#)

Location: Any Centrica office

We are looking for an experienced Application Support Developer to support and enhance a suite of in‑house developed applications used to collect and process data from remote assets. These systems support monitoring, analysis, reporting, resource management and billing activities across the business.
This role combines hands‑on .NET development, application support, data analysis and customer interaction, offering variety and ownership in a technically interesting environment.

What you’ll be doing:

• Providing professional telephone and email support to an established customer base, ensuring queries are addressed effectively and in a timely manner
• Maintaining, enhancing and refining existing .NET / C# applications in line with evolving business requirements
• Taking ownership of the monthly billing process, ensuring accurate and on‑time delivery of customer invoices
• Performing system administration tasks including user access management, housekeeping and end‑user training
• Validating and reconciling data across multiple platforms and data sources
• Designing, producing and rebranding standard and bespoke customer reports using SQL data sources
• Identifying, investigating and resolving data anomalies, presenting findings clearly to stakeholders
• Supporting process improvements and operational efficiencies
• Contributing to innovation projects and new system developments

What we’re looking for:

• Significant commercial experience in application development using Visual Studio, .NET / C# and SQL databases
• Strong data management and analysis skills, with experience working with large data sets
• Proven ability to create meaningful management information and customer reports
• Highly proficient in Microsoft Excel, including advanced formulas and VBA scripting
• A methodical approach to problem‑solving and investigation
• Strong communication skills and a customer‑focused mindset

It would be nice to have:

• An understanding of IT networking concepts
• Experience working within the energy or utilities sector

Why should you apply?

We’re not a perfect place – but we’re a people place. Our priority is supporting all of the different realities our people face. Life is about so much more than work. We get it. That’s why we’ve designed our total rewards to give you the flexibility to choose what you need, when you need it, making sure that you and your family are supported not only financially, but physically and emotionally too. Visit the link below to discover why we’re a great place to work and what being part of more means for you.

https://www.morethanacareer.energy/britishgas

If you're full of energy, fired up about sustainability, and ready to craft not only a better tomorrow, but a better you, then come and find your purpose in a team where your voice matters, your growth is non-negotiable, and your ambitions are our priority.

Help us, help you. We would love for you to share any information about yourself throughout our recruitment process so that we can better understand you and help shape your journey.