About Assystem Join Assystem – Accelerating the Energy Transition At Assystem, we are on a mission to accelerate the energy transition worldwide. With 7,500 Switchers globally, we combine decades of engineering expertise with innovative digital technologies to deliver safe, low-carbon energy projects. Why Join the Community of Switchers? As one of the top three nuclear engineering companies in the world, joining Assystem means becoming part of an elite team shaping the future of energy. You’ll contribute to critical missions while working alongside experts in their fields. The Job Mission As an Accounts Assistant, your mission is to ensure accurate and efficient financial processes across staff expenses and supplier accounts. This role is vital to supporting our operations, combining detail-oriented work with collaborative problem-solving. Please note – this is a part-time role, offering 25 hours per week, with flexibility over working days. Your key responsibilities will include: Checking and processing expense claims per company policies and HMRC guidelines Managing the monthly staff expense payment process Maintaining staff expense advance files and company car/car allowance records Liaising with HR and recruitment regarding relocation expenses Updating and maintaining HMRC fuel rates quarterly on internal systems Processing contractor timesheets and supplier invoices Supporting general accounts administration and team absence cover Essential Skills & Qualifications Accounting knowledge with strong administration abilities Confident user of Microsoft Office (Excel, Word, and Teams) Ability to prioritise tasks and meet deadlines independently Strong teamwork mindset and problem-solving skills Previous experience in an accounts department Desired Skills Familiarity with staff expenses and HMRC guidelines Why Apply? Join us and help drive the success of critical energy projects. You’ll be part of a forward-thinking team, where your work directly contributes to impactful outcomes in the energy sector. We are committed to equal treatment of candidates and promote, as well as foster all forms of diversity within our company. We believe that bringing together people with different backgrounds and perspectives is essential for creating innovative and impactful solutions. Skills, talent, and our people’s ability to dare are the only things that matter Bring your unique contributions and help us shape the future. Are you a prospective or recent graduate? Assystem offers you the opportunity to join our Switch to Grow UK Graduate Scheme, where you’ll gain hands-on experience in engineering, digital services, and project management by working on some of the world’s most critical energy projects. Be part of the challenge of the century; accelerating the switch to low carbon energy