C# .NET Software Developer (Full time or Part time)

GMSL; Ivy Chimneys; Hybrid; GBP 50,000 - 70,000; Full time

Job summary

A leading energy portfolio management company in Cambridge is seeking an experienced C# .NET Software Developer. In this role, you will work within a small, agile team to enhance the company's power-scheduling software. The ideal candidate will have over five years of development experience utilizing C# and .NET, along with a collaborative mindset to tackle complex challenges. This opportunity offers benefits including flexible working hours and a supportive team environment.

Benefits

Annual bonus scheme

Company pension scheme (6% employer contribution)

25 days holiday

Private health care

Flexible working hours

Casual dress

Employee assistance program

Loyal service award

Cycle to Work scheme

Fresh fruit and great coffee

Monthly team pub lunches

Qualifications

• Minimum of five years development experience using C# & .NET in a commercial environment.
• Experience in enterprise product development relevant to the business.
• Comfortable working in an agile environment; familiarity with eXtreme Programming practices.

Responsibilities

• Develop features for power-scheduling software in an agile team.
• Collaborate with product owners, testers, and developers.
• Refactor complex codebases according to SOLID principles.

Skills

Logical thinking

Pragmatic decision making

Effective communication

Collaborative problem-solving

Active listening

ASP.NET Core

RESTful APIs design

MVC patterns

JavaScript, CSS, HTML

C#

SQL Server

CI/CD implementations

Tools

ASP.NET Core

SQL Server

Job description

Opportunity

We have a great opportunity for a C# .NET Software Developer to join our fantastic software development team based in Cambridge. This is an ideal role for someone who wants to join a friendly, small and highly technical team where you can have a real impact.

The role

You will be embedded as a full‑stack developer in one of our small agile development teams. You will collaborate alongside product owners, testers and other developers to develop features for our power‑scheduling software product.

The product

Our power‑scheduling system includes a web application, windows services and APIs that provide comprehensive coverage of the European power markets and simplify complex B2B communication protocols and data formats, making it easier for users to manage their portfolios.

Our products are used by GMSLs own operations team to serve a wide range of clients, including banks, energy firms, and traders. Customers also license the software for use by their own operations teams.

The technology

We Use The Following Tech Stack

• ASP.NET Core
• C# .NET8 (though moving to .NET10 soon)
• Entity Framework Core
• SQL Server

Your Skills

• You will need to be great at thinking logically, but also laterally.
• You make pragmatic choices when implementing changes.
• You must be able to communicate your thoughts well.
• You should enjoy collaborating with others and relish solving challenging problems.
• You actively listen and provide thoughtful solutions.
• ASP.NET Core
• Experience designing and consuming RESTful APIs according to best practices
• Knowledge of hosting environment configuration, authentication & certificate management
• Thorough understanding of MVC patterns such as MVVM
• Good working knowledge of JS, CSS + HTML
• C#
• Architecting modern solutions to replace existing functionality
• Refactoring a complex codebase according to SOLID principles & design patterns
• SQL Server
• Experience investigating performance issues including index tuning
• CI/CD
• Implementing modern CI/CD pipelines in place of legacy build & deployment processes

Your Experience

• You will have a minimum of five years development experience using C# & .NET in a commercial environment.
• Experience in enterprise product development would be particularly relevant to our business.
• You will be comfortable working in an agile environment. Experience of any eXtreme Programming practices that are key to being agile, such as TDD, Pair Programming, SOLID, Simple Design would also be beneficial.

Salary And Benefits

The C#.Net Software Developer is offered on a permanent basis, full time (37.5 hours per week Monday to Friday) or part‑time (minimum 30 hours per week worked over 5 days Monday to Friday).

Salary will be reflective of your level of experience and adjusted pro‑rata for part‑time candidates.

All our teams spend at least one day a week in our offices in Cambridge, this role requires 2–3 days a week in office, so you need to be based within easy travel to Cambridge.

We welcome applications for flexible working arrangements.

Our Benefits Include

• Annual bonus scheme
• Company pension scheme (6% employer contribution)
• 25 days holiday
• Private health care
• Flexible working hours and remote working
• Casual dress and a relaxed environment
• Employee assistance program
• Loyal service award
• Cycle to Work scheme
• Fresh fruit and great coffee
• Free access to Cambridge University Botanic Gardens
• Monthly team pub lunches

How To Apply

• Simply email us your CV and covering letter to with the reference C#.Net Software Developer and should your CV be shortlisted, we will share with you some screening questions to help us evaluate your technical expertise.
• So we can support you during the application and interview process, please contact for any recruitment adjustments.
• GMSL have a responsibility to ensure that all employees are eligible to live and work in the UK, proof of right to work in the UK will be requested prior to employment.

GMSL

• GMSL is the market‑leading provider of 24/7 energy portfolio management services and software in Europe and plays a vital role in the energy business. We have unparalleled expertise in the industry, built up over 25 years of operating in energy markets throughout Europe.
• Our software is used by some of the largest energy companies in the world and is developed using our unique operations experience, giving us clear insight into our customers needs.
• We have a fantastic team of people and have a well‑developed human‑centered understanding of how to develop software, so this is a great opportunity for someone who wants to join a friendly, small and highly technical team where you can have a real impact. For more background on GMSL see gmsl.co.uk

Working at GMSL

We are a small team. We have around 40 people in our software team, so even though we are a part of a company of around 120 people overall, the software team has retained a small team startup feel. Your colleagues will be from a wide variety of backgrounds we encourage diversity, openness and gender equality.

We value the long‑term. The success and stability that comes from 25+ years experience in software development means we value the long‑term in terms of software development and the development of our people.

We empower teams and individuals. Teams are empowered to own their products. Individuals are empowered to make meaningful contributions at every level.

We are agile. We develop using an agile approach, which focuses on our ability to respond to change. We broadly follow XP practices, but we take a pretty pragmatic view about this. We adapt our processes to support the context, rather than follow a standard rigid process for all situations. We trust the teams who do the work to decide how best to do it.

We strive to make GMSL a great place to work. The management team are friendly, approachable and care personally about the people on their team. Managers consider the people on their team as the first priority and take our peoples personal situations into account in decision‑making wherever they can.

We are flexible. Our teams typically work at least one day a week in our office in Cambridge, and the rest of the time working from home. We also have a day a month where the whole software department come in and we all go to the pub for lunch. Hours are flexible and are based on the needs of the team.

Recruitment Agencies

We are not currently accepting recruitment agency applications well be in touch if we need you to help us. Thanks for your understanding.