Assystem Bristol, England, United Kingdom

Mechanical Design Engineer - Valves

Assystem Bristol, England, United Kingdom

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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 Hinkley Point C, Sizewell C and SMRs. Become part of an elite global community, driving innovation and excellence every day.

The Job Mission

We are seeking a Mechanical Design Engineer to 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.
• 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.

Benefits include:

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

Competitive Sick Pay – Support when you need it

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 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.

Seniority level

• Seniority level

  Mid-Senior level

Employment type

• Employment type

  Full-time

Job function

• Industries

  Business Consulting and Services, Services for Renewable Energy, and Engineering Services

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