Senior Mechanical Engineer

️About AssystemJoin Assystem, a global leader in engineering and project management, driving the energy transition worldwide. With over 7,500 Switchers, we blend our extensive engineering heritage with cutting-edge digital technologies to support vital infrastructure projects. Our mission is to accelerate the clean energy transition, and we're seeking passionate professionals to be part of this journey.

Why Join the Community of Switchers?As one of the top three nuclear engineering companies globally, Assystem offers unparalleled opportunities to work on some of the most significant nuclear projects in the world. Join our community and be part of a team that's shaping the future of clean energy, while benefiting from a dynamic, collaborative work environment.

Job Description

The Job Mission
We are seeking a Senior Mechanical Engineer to take a leading role in the successful delivery of Hinkley Point C. Embedded within the client's organisation, you will provide critical oversight across design activities, ensuring alignment with safety, regulatory, and strategic objectives. You will serve as a key interface between stakeholders and technical functions, supporting high-impact decision-making.

Your key responsibilities will include:

• Lead technical assessment and response to design queries, non-conformances, and exemption requests
• Ensure project alignment with UK safety and environmental regulations
• Evaluate and challenge design decisions in line with project objectives
• Coordinate and integrate support from external design and delivery teams
• Drive resolution of outstanding technical and design-related issues
• Mitigate risks across the mechanical scope by applying expert engineering judgment
• Foster strong, solution-driven relationships with Responsible Designers and delivery stakeholders
• Provide clear, consistent reporting to the Engineering Lead and wider project team

My profile

• Degree-qualified in Mechanical Engineering (BEng/MEng)
• Proven track record in mechanical design, installation, or commissioning
• Expert knowledge of construction and installation standards (CDM, EN, ASME)
• Demonstrated ability to lead independently and escalate critical issues
• Experience operating in high-complexity, multidisciplinary project environments
• Strong stakeholder engagement and coordination capabilities
• Familiarity with welding processes and quality standards
• Previous experience working in a site-based engineering role

Why Apply?Be part of your future team that's at the forefront of the nuclear industry, working on missions critical to the energy transition. This is your chance to influence major projects and develop your career with one of the largest nuclear engineering firms globally.

Benefits include:

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!