Senior Mechanical Engineer

Company Description

⚡️💡 About Assystem
Assystem is an international engineering and project management group accelerating the energy transition worldwide. Our 8,000 Switchers combine decades of engineering expertise with digital innovation to deliver complex, safety-critical infrastructure. In the UK, we play a key role on landmark programmes including Hinkley Point C, Sizewell C and emerging Small Modular Reactor developments, supporting the delivery of secure, low-carbon energy for the future.

🤝 Why Join the Community of Switchers?
You will be joining one of the three largest nuclear engineering companies in the world, working at the heart of the UK’s most significant energy programme. Assystem offers exposure to world-class projects, long-term career stability, and the opportunity to work alongside highly experienced engineers and delivery teams. Your future team values collaboration, practical problem solving, and engineers who want to make a real impact on site.

Job Description

🚀 The Job Mission

This is a hybrid role, with a strong on-site presence required in Bridgwater, with relocation support available where needed. You will be operating within the Technical Branch, the role focuses on resolving complex, cross-discipline engineering challenges across the project. Within your role, you'll be acting as a technical authority, the position ensures safety, compliance, and delivery across design and construction interfaces.

🔧Lead resolution of complex multidisciplinary design and construction engineering issues
🛠️Provide technical oversight of safety classified design changes and modifications
📊Prepare and author technical justifications, reviews, and decision documentation
⚙️Support configuration management and control of as-built design information
🔍Ensure integrity of nuclear safety case for all engineering changes
🤝Engage with stakeholders including designers, contractors, and project teams
📐Drive pragmatic engineering solutions across mechanical and system interfaces
🧠Lead or support technical task forces for high-risk engineering challenges
📢Represent engineering decisions with clear risk-based justification
🚧Support resolution of site queries during construction and commissioning phases

Qualifications

Nuclear experience is not essential, but is of course welcome. If you have worked within a highly regulated environment, your skills and approach are highly transferable and of strong interest to us.

We also recognise that the perfect candidate rarely exists. If you feel you meet around 80% of the criteria and are motivated to develop further, we would strongly encourage you to apply

🎓Degree in Mechanical or equivalent qualification
🏭Experience working within highly regulated industrial or engineering environments
🛢️Background in piping systems, fabrication, or pressure systems engineering
🤝Proven stakeholder management across multidisciplinary engineering teams
🏗️Understanding of mechanical, electrical, and civil interfaces on construction sites
📍Experience working in site-based engineering roles or project environments
🔬An understanding of NDT methods such as UT, RT, PT, and MT would be desirable
📄Ability to produce and review technical documentation and justifications
⚖️Experience assessing engineering risk and supporting safety case requirements

Additional Information

🌟 Ready to Make an Impact?

This is an opportunity to contribute to nationally significant energy infrastructure while developing your technical depth within a globally recognised engineering organisation. If you want real responsibility, exposure to complex mechanical systems, and the chance to grow within one of the world’s leading nuclear engineering companies, this role offers long-term progression and stability.

Benefits include:
🏡 Hybrid Working Opportunity
🕒 Flexible working hours
🛡️ Market Leading Pension scheme (8% company contribution / 4% personal contribution)
🏖️ 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 & 3x 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 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.