# Senior Mechanical Building Service Engineer* Nuclear* Permanent /* Bristol* United Kingdom* 13/05/26* On site* ShareI apply##️ **About Assystem** At Assystem, our mission is to accelerate the energy transition worldwide. Today, Assystem is among the top three independent nuclear engineering firms worldwide. With over 60 years of experience in highly regulated sectors, the group supports public and industrial stakeholders in the execution of complex and strategic infrastructure projects, subject to high safety and security requirements. Assystem mobilizes 8,000 experts in 13 countries and intervenes across the entire project lifecycle, in engineering, project management and digital solutions. Join us in revolutionizing the energy sector and making a significant global impact. **Why Join the Community of Switchers?** Be part of one of the top three largest nuclear engineering companies globally. At Assystem, you’ll contribute to groundbreaking projects that push the boundaries of ...