Senior Mechanical Engineer - Replication and Integration

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• Full-time
  
• Type of contract ASSYSTEM: Permanent
  
• ASSYSTEM Sector: Nuclear
  

⚡️💡 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.

🚀 This hybrid role is based in Bridgwater and is suited to candidates living within commuting distance of the area or willing to relocate. The role supports configuration alignment and engineering integration across two major nuclear programmes. Your future team ensures lessons learned from established nuclear projects are captured and applied to replication activities, and focuses on strengthening configuration management and engineering coordination across Mechanical, Piping and HVAC systems.

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• 🔧Coordinate Mechanical, Piping and HVAC work packages within configuration management systems
  
• 📊Develop reference configuration datasets supporting replication across nuclear programmes
  
• 🔍Analyse engineering datasets to identify improvements in configuration processes
  
• ⚙️Support development of engineering sequences required for replication activities
  
• 📁Develop and maintain configuration management standards, procedures and guidance
  
• 🏗️Resolve installation issues including dimensional discrepancies and equipment clashes
  
• 🔗Collaborate with multidisciplinary stakeholders to ensure technical alignment across projects
  
• 📈Support tracking and reporting of engineering activities across Mechanical, Piping and HVAC scopes
  

Nuclear experience is valuable, particularly from new build, decommissioning or defence programmes. Engineers from other highly regulated sectors such as major energy infrastructure may also bring transferable experience in configuration control and complex engineering delivery.

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.

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• 🎓Bachelor’s or Master’s degree in Mechanical Engineering or related discipline
  
• ⚛️Experience within nuclear, defence or highly regulated engineering environments
  
• 📐Strong understanding of configuration management and engineering design control
  
• 🔧Experience working within complex mechanical systems on major infrastructure programmes
  
• 📊Ability to analyse engineering datasets and identify improvement opportunities
  
• 📁Experience managing engineering documentation and configuration baselines
  
• 🏗️Understanding of installation, commissioning and engineering transition phases
  

🌟 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.

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• 🏡 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.