️ About Assystem

Assystem is committed to accelerating the global energy transition. With over 7,500 Switchers across the globe, we combine deep-rooted engineering expertise with digital innovation to help build a sustainable energy future. In the UK, we play a vital role in landmark projects such as Hinkley Point C, Sizewell C, and the development of SMRs, supporting the safe and efficient delivery of nuclear power infrastructure.

Why Join the Community of Switchers?

You’ll be joining one of the top three nuclear engineering companies in the world. Our mission-led approach places you at the heart of the energy transition. At Assystem, you’ll collaborate with industry leaders, contribute to world-class nuclear projects, and gain exposure to some of the most ambitious engineering programmes on the planet.

The Job Mission

Hinkley Point C is now entering peak mechanical, electrical, and commissioning activity. You’ll be based on-site at Bridgwater as part of a hybrid working model (3 days on-site). To succeed in this role, you’ll need to live within a commutable distance of the site. We offer a relocation allowance to support your move and help you settle locally.

We're looking for experienced mechanical engineers from across the UK nuclear sector to join our delivery teams on-site in Bridgwater. Whether your background is in , decommissioning, research, or new build — this is your opportunity to bring your skills into a flagship programme moving into its most exciting phase.

Your role may include:

⚡️ Leading or supporting mechanical installation and interface resolution on HPC systems

⚡️ Developing and reviewing technical specifications for nuclear-classified equipment

⚡️ Coordinating with contractors, suppliers and internal stakeholders on design change control

⚡️ Supporting pressure testing, inspection and surveillance across large bore piping systems

⚡️ Working across valves, turbines, pumps, tanks, HVAC or specialist mechanical packages

⚡️ Assisting with mechanical commissioning readiness, execution and handover

⚡️ Supporting the resolution of open points and site-based technical issues

⚡️ Ensuring alignment with nuclear safety cases and ONR expectations

Essential Skills:

Mechanical engineering background with experience on UK nuclear projects

Experience with piping, pressure systems, rotating equipment, tanks, valves or HVAC

Familiarity with nuclear site practices, documentation and lifecycle phases

Ability to operate confidently in multidisciplinary site-based teams

Willingness to relocate to Bridgwater and commit to regular on-site delivery

Desired Skills:

✔️ Experience supporting installation or commissioning of nuclear mechanical systems

✔️ Understanding of safety case principles and design change processes

✔️ Experience resolving interface challenges

✔️ Involvement in contractor surveillance or site technical coordination

Ready to shape the future? Join your future team on-site at one of the most ambitious nuclear power projects in Europe. Be part of a collaborative mission to uphold the highest construction and quality standards.

Benefits include:

Hybrid Working Opportunity

Flexible working hours

️ Pension scheme (8% company / 4% personal)

️ 25 days’ paid annual leave + bank holidays + option to buy or sell days

Professional fees reimbursed

Employee referral scheme

Competitive Sick Pay – Support when you need it

Income Protection & 3× Salary Death-in-Service Cover

Free Digital Gym Access – Expert-led fitness classes

24/7 Employee Support Line – Mental health, financial & legal help

We are committed to equal treatment of candidates and promote, as well as foster all forms of 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