Senior Mechanical Design Engineer

Assystem is a global leader committed to accelerating the energy transition. With 7,500 employees across 12 countries, we tackle the monumental task of switching to low‑carbon energy. Our 55+ years of experience in highly regulated sectors ensure we deliver top‑notch engineering, project management, and digital solutions.

• Develop 2D CAD drawings, including detailed process flow diagrams (PFD) and process and instrumentation diagrams (P&ID).
• Prepare 3D CAD/BIM models, covering plant layouts, piping design, isometrics, MTO, general arrangement drawings, detailed drawings, and sketches.
• Perform layout optimisation engineering throughout design phases to maximise efficiency and effectiveness.
• Participate in 3D model reviews, layout reviews, design reviews, and technical meetings to ensure precision and alignment.
• Ensure compliance with all design safety factors, tolerances, specifications, standards, codes, legislation, and requirements.
• Collaborate with multi‑disciplinary engineering teams to achieve a coordinated and cohesive design.
• Maintain thorough records of the design process in line with best practices, ensuring meticulous documentation.
• Update and manage databases for CAD/BIM design documentation, keeping everything current and organised.
• Report status and updates to the management team to keep everyone informed and aligned.
• Support the team by upholding high standards, meeting targets, and adhering to quality, time, and budget constraints.
• Mediate and resolve issues with all stakeholders, ensuring solutions are aligned and effective.
• Adhere to company statutory H&S Policies and rules, maintaining compliance with project and quality standards.

• Experienced Mechanical Design Engineer or similar role, ready to drive innovation and excellence.
• Collaborative team player with a knack for transforming concepts into reality through engineering teamwork.
• Proficient in 2D CAD systems like AutoCAD for creating precise and detailed drawings.
• Skilled in 3D CAD/BIM systems (Revit, Inventor, Solidworks, Solid Edge, Siemens NX, PDMS, AutoCAD Plant 3D, or similar) for crafting dynamic models and drawings.
• Professionally qualified in an engineering‑related field, bringing expertise and technical prowess.
• SC Clearance or the capability to achieve it, ensuring readiness for high‑security projects.

• 🌟 Over 55 years in nuclear engineering.
• 🏆 Ranked among the top 3 largest nuclear engineering companies.
• 💼 Attractive social benefits, including an engaging Employee Committee and holiday bonuses.
• 📚 Ongoing training with numerous career opportunities.
• 📈 70% of our managers are promoted internally!
• 🏠 Hybrid work: 1‑2 days remote per week.

Due to the nature of the work, applicants must meet UK security clearance criteria.

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.

Ready to make a difference in the nuclear engineering world? Join us and be a part of the future of nuclear and fusion innovation! 🌐✨