Salary: £68,000 - 108,000 per year Requirements: Minimum of five years development experience using C# & .NET in a commercial environment. Experience in enterprise product development. Comfortable working in an agile environment. Familiar with eXtreme Programming practices such as TDD, Pair Programming, SOLID, Simple Design. Strong logical and lateral thinking skills. Ability to communicate effectively. Enjoy collaborating with others and solving challenging problems. Active listening and providing thoughtful solutions. Experience designing and consuming RESTful APIs. Knowledge of hosting environment configuration, authentication & certificate management. Understanding of MVC patterns such as MVVM. Good working knowledge of JavaScript, CSS, and HTML. Experience in architecting modern solutions and refactoring complex codebases according to SOLID principles. SQL Server experience, particularly in investigating performance issues including index tuning. Experience implementing modern CI/CD pipelines. Responsibilities: Collaborate within a small agile development team to develop features for our power-scheduling software. Engage in practices inspired by eXtreme Programming. Participate in Daily Stand-ups and Retrospectives. Make pragmatic choices when implementing changes. Communicate thoughts and ideas clearly to team members. Work closely with product owners, testers, and other developers. Contribute to the design and implementation of RESTful APIs. Help ensure best practices in hosting environment configuration and certificate management. Architect and refactor existing systems according to industry standards. Investigate and troubleshoot performance issues in SQL Server. Technologies: Architect C# CI/CD CSS JavaScript MVC MVVM SQL TDD ASP.NET API Backend Embedded More: We are GMSL, the market-leading provider of 24/7 energy portfolio management services and software in Europe. With over 25 years of experience, we develop software that meets the needs of some of the largest energy companies globally. Joining our friendly and highly technical team in Cambridge offers you the chance to make a real impact. Our benefits include an annual discretionary bonus scheme, a competitive pension scheme, 25 days holiday, private healthcare, flexible working hours, and a relaxed environment. We are committed to maintaining a diverse workplace and ensuring that all employees are eligible to live and work in the UK. last updated 9 week of 2026