Information Technology Developer

Location: Watford (Hybrid – 3 days office based and 2 days working from home)

Salary: Competitive + Benefits

Closing date: 31st July 2026

At Corona Energy, we are proud to be one of the UK’s leading independent energy suppliers, with over 30 years of experience supporting businesses across the UK. Today, we supply approximately 14% of the industrial and commercial gas market, serving around 13,000 gas and electricity customers.

Our success is built on our people. We believe that when our employees thrive, our business thrives. That’s why we’ve created a culture that encourages collaboration, rewards innovation, and supports continuous development. We are passionate about delivering exceptional customer service while investing in the growth and wellbeing of our teams.

We are looking for an IT Developer to become a key technical leader within our growing team. In this role you will have ownership of one of our most business-critical systems—
my Corona
, our customer portal—and play a central role in developing the next generation of internal applications, automation solutions, and AI-enabled technologies.

This position combines two exciting work streams:

You will take ownership of our customer portal ecosystem, driving enhancements, maintaining integrations, and ensuring an exceptional customer experience.

You will help build new applications and business capabilities across the Microsoft technology stack, while exploring and implementing emerging technologies including Microsoft Power Platform, Copilot Studio, Azure AI Services and Foundry.

Working closely with key members of the team you will help shape not only what we build, but how we build it.

This role offers genuine ownership, technical influence, and the opportunity to leave a lasting mark on a technology function that is actively modernising and embracing AI-enabled solutions.

• Take primary ownership of the my Corona customer portal.
• Design, build and maintain high-quality applications using C# and .NET.
• Develop scalable RESTful APIs and backend services.
• Enhance and support integrations with core business systems including Dynamics 365 and SQL Server environments.
• Deliver secure, reliable, and maintainable solutions.

• Translate business requirements into elegant technical solutions.
• Design systems with scalability, resilience, and long-term maintainability in mind.
• Write clean, efficient, well-documented code.
• Conduct and participate in code reviews.
• Champion modern development best practices and coding standards.
• Develop comprehensive automated testing solutions to ensure software quality.
• Contribute to the transformation of legacy applications and integrations.
• Help shape Corona's future technology landscape.
• Build internal tools using Microsoft Power Platform technologies.
• Explore AI-enabled solutions that improve business processes and customer experiences.
• Bring innovative ideas and recommendations to the wider IT team.
• Work closely with analysts, data specialists, project teams, and business stakeholders.
• Provide technical guidance and expertise across projects.
• Act as a senior technical voice within the development function.
• Support architectural discussions and technical decision‑making.

• Provide second-line application support alongside our Managed Service Provider.
• Investigate and resolve complex application and integration issues.
• Monitor portal, API, and data pipeline performance.
• Support ongoing operational stability and continuous improvement.

• 5+ years' professional software development experience.
• Strong hands‑on experience developing with C# and .NET Framework.
• Proven experience building RESTful APIs and service‑based architectures using ASP.NET.
• Experience working with Microsoft SQL Server, including query optimisation, schema design and stored procedures.
• Experience developing and deploying solutions within Microsoft Azure environments.
• Comfortable working across both modern and legacy application estates.
• Strong Git Hub and source control experience, including pull requests and code reviews.
• Experience…