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.