Senior Mechanical Design Engineer

CompanyAssystem

LocationWarrington, England, United Kingdom

Posted At2/18/2026

UK Visa Sponsorship Analytics

Occupation Type

Mechanical engineers

Occupation Code Skill LevelHigher Skilled

Sponsorship Salary Threshold

£46,800 (£24.00 per hour)

Occupation rate applies

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Description

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.

Job Description

🚀 Join the Fusion and Modular Nuclear Business Unit! 🚀Reporting to the Turbine Island Lead, the Senior Mechanical Design Engineer will be responsible for developing fluid systems. The Senior Mechanical Design Engineer shall work closely with multi-disciplined teams and the supply chain to help deliver the system design. 

Your mission:

🖥️ 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 optimization engineering throughout design phases to maximize 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 organized.

📈 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.

Why Join the Community of Switchers?

🌟 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.

Qualifications

🔧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.

Additional Information

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

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

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.