️About Assystem

Assystem is a global leader in engineering, digital, and project management services, driving the UK’s energy transition since 1996. With 7,500 Switchers worldwide, we combine deep engineering expertise with digital innovation to deliver complex, low-carbon infrastructure. In the UK, we’re proud to support landmark nuclear projects like Hinkley Point C, Sizewell C, and emerging SMR programmes.

Why Join the Community of Switchers?

Join one of the three largest nuclear engineering companies in the world. Here, you’ll work on world‑class energy‑transition missions, collaborating with top teams delivering HinkleyPointC, SizewellC and SMRs. Become part of an elite global community, driving innovation and excellence every day.

Job Description

The Job Mission
We are seeking aMechanical Design Engineerto support the delivery of operating equipment, specifically valves and fluid handling equipment. This is a hybrid role (2 -3 days in the office) and involves working closely with external suppliers and ensuring successful integration of equipment into the plant.

Your future team will rely on you for:

• Creating and amending technical specifications for new equipment scopes.
• Performing surveillance and approval of contractor deliverables and design activities.
• Supporting technical and project meetings with suppliers and internal stakeholders.
• Assisting in resolving multi-disciplinary technical issues, including addressing interface queries and design changes.
• Coordinating technical specialists for reviewing deliverables and resolving technical concerns.
• Reviewing and providing input on contract amendments and exemptions.
• Liaising with RD and client teams to ensure proper equipment integration.

My profile

Essential Skills & Qualifications

• Strong understanding of mechanical interfaces (piping, fluids, radioprotection, safety).
• Good knowledge of valves and fluid handling systems
• Capable of producing high-quality technical specifications
• Sound understanding of mechanical engineering regulations in safety-critical environments
• Previous experience working on large-scale industrial projects

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.

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!