Senior Developer

Senior Developer

Location: Kings Hill/Hybrid

Salary/package: £55,000 per annum

Contract type: Permanent

Hours: Full time, 37 hours per week

We’re looking for a skilled Senior Developer to join our team at Commercial Services Group. This is an exciting opportunity to work across desktop, web, and mobile applications, delivering innovative solutions that meet the evolving needs of our customers while mentoring the next generation of developers.

Who we are

Commercial Services Group (CSG) is the UK’s largest local authority-owned trading organisation. CSG provides IT solutions that support our 33 diverse business units across the UK and internationally, enabling them to deliver high-quality services to education, public sector, and commercial clients. Our in-house development team plays a critical role in driving digital transformation across the organisation.

Why this role matters

The Senior Developer role is central to the creation, improvement, and maintenance of applications that support CSG’s strategic objectives. By developing robust, secure, and scalable software, you’ll help streamline operations, improve customer experiences, and support the growth of our services. Your technical expertise and leadership will also help shape best practices and mentor less experienced team members.

What you’ll be doing

Gather customer requirements and translate them into functional designs and software solutions

Design, develop, test, deploy, and maintain applications, web services, APIs, and integrations

Utilise development tools and frameworks such as PowerBuilder .NET, C#, ASP.NET, Angular, SQL Server, and MS Power Suite

Create and maintain technical documentation, specifications, and test plans

Collaborate with cross-functional teams to deliver features on time and within budget

Write clean, scalable, secure, and efficient code aligned with CSG’s development and security standards

Conduct code reviews and provide constructive feedback to colleagues

Mentor junior developers and share knowledge across the team

Troubleshoot, debug, and optimise existing software for performance and reliability
What we’re looking for

Degree in Computer Science, Engineering, or related field (or equivalent experience)

Minimum 3 years’ experience in systems development within a similar role

Proficiency in .NET languages (e.g., C#), ASP.NET, SQL Server, and MVC frameworks

Experience with RESTful APIs, web services, and front-end frameworks (preferably Angular)

Familiarity with Agile/Scrum methodologies and tools such as Azure DevOps

Strong problem-solving skills and attention to detail

Ability to mentor and collaborate effectively with team members

Willingness to learn legacy technologies (PowerBuilder .NET) and support migration projects
What you’ll get in return

25 days annual leave, plus your birthday off

Life assurance cover (4x salary)

Pension scheme with up to 6% employer contribution

Additional benefits including retail and gym discounts, health cash plan and cycle to work scheme

Volunteer days and access to a comprehensive wellbeing programme

Tailored learning and development support with real opportunities to progress
Why CSG?

Commercial Services Group (CSG) is the UK’s largest local authority-owned trading company (LATCO), generating over £800 million in revenue and supporting 16,000 education and public sector customers worldwide. With more than 1,800 employees across the UK, France, Dubai and Bangkok, we are working towards becoming the global leader in education and public sector solutions.

We are expanding rapidly, with annual growth of around 25 percent, supported by a blend of organic development, acquisitions and strategic partnerships. Our 33 trading businesses deliver a wide range of services including education management, IT, HR, legal, energy, procurement and supplies.

CSG is wholly owned by local authorities, and a significant proportion of our profits is reinvested into frontline public services. Over £77 million has already been returned, reflecting our commitment to combining commercial performance with meaningful social impact.

Inclusion & Accessibility

We are committed to fostering a diverse and inclusive workplace where everyone feels valued and respected. We encourage applications from suitably qualified people of all backgrounds.

We are committed to providing reasonable adjustments throughout our application and interview process; please let us know if you require any