Warrington, England, United Kingdom · On-site
Company Description 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 stakehold…
Skills: Mechanical Design, Nuclear Engineering, Design For Assembly, Technical File Production, UK CA Compliance
Warrington, England, United Kingdom · On-site
Company Description 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 stakehold…
Skills: Mechanical Engineering, Ventilation Engineering, Nuclear Ventilation Systems, HEPA Filter Commissioning, Asset Condition Inspection
Derby, England, United Kingdom · Hybrid
$51k–$67k/yr
Role Title: Senior Engineer - Thermofluids Model Validation We are Rolls-Royce SMR and we’re doing something that’s never been done before. We’re revolutionising an industry. That’s a once-in-a-career opportunity for tho…
Skills: Fluid Dynamics, Thermal Processes, RELAP, Flomaster, Vipre
Derby, England, United Kingdom · Hybrid
$60k–$79k/yr
Role: Engineering Capability Lead – Process Optimisation Locations: Hybrid working with with your primary office location being which ever is closest to you: Derby, Warrington or Manchester Company Mission Our mission is…
Skills: Process Optimisation, Continuous Improvement, Stakeholder Engagement, KPI Development, Engineering Governance
Derby, England, United Kingdom · Hybrid
$60k–$79k/yr
Role: Engineering Capability Lead – Process Optimisation Locations: Hybrid working with with your primary office location being which ever is closest to you: Derby, Warrington or Manchester Company Mission Our mission is…
Skills: Process Optimisation, Continuous Improvement, Stakeholder Engagement, KPI Development, Engineering Governance
Derby, England, United Kingdom · Hybrid
$60k–$79k/yr
Role: Engineering Capability Lead – Process Optimisation Locations: Hybrid working with with your primary office location being which ever is closest to you: Derby, Warrington or Manchester Company Mission Our mission is…
Skills: Process Optimisation, Continuous Improvement, Stakeholder Engagement, KPI Development, Engineering Governance
Derby, England, United Kingdom · Hybrid
$60k–$79k/yr
Role: Engineering Capability Lead – Standards Location: Hybrid working with with your primary office location being which ever is closest to you: Derby, Warrington or Manchester Company Our mission is to deliver clean, a…
Skills: Engineering Standards, Technical Governance, Regulatory Alignment, Systems Thinking, Audit And Assurance
Derby, England, United Kingdom · Hybrid
$60k–$79k/yr
Role: Engineering Capability Lead – Standards Location: Hybrid working with with your primary office location being which ever is closest to you: Derby, Warrington or Manchester Company Our mission is to deliver clean, a…
Skills: Engineering Standards, Technical Governance, Regulatory Alignment, Technical Documentation, Systems Thinking
Derby, England, United Kingdom · Hybrid
$60k–$79k/yr
Role: Engineering Capability Lead – Standards Location: Hybrid working with with your primary office location being which ever is closest to you: Derby, Warrington or Manchester Company Our mission is to deliver clean, a…
Skills: Engineering Standards, Technical Governance, Regulatory Alignment, Systems Thinking, Audit and Assurance
Derby, England, United Kingdom · Hybrid
$51k–$67k/yr
Role Title: Senior Engineer - Containment Analysis We are Rolls-Royce SMR and we’re doing something that’s never been done before. We’re revolutionising an industry. That’s a once‑in‑a‑career opportunity for those excite…
Skills: Thermal-hydraulic modelling, Fluid dynamics, Python, Safety case authorship, Verification and validation
Derby, England, United Kingdom · Hybrid
$51k–$67k/yr
Role Title: Senior Engineer - Thermofluids Model Validation We are Rolls-Royce SMR and we’re doing something that’s never been done before. We’re revolutionising an industry. That’s a once-in-a-career opportunity for tho…
Skills: Fluid Dynamics, Thermal Processes, RELAP, Flomaster, Vipre
Derby, England, United Kingdom · Hybrid
$51k–$67k/yr
Role Title: Senior Engineer - Containment Analysis We are Rolls-Royce SMR and we’re doing something that’s never been done before. We’re revolutionising an industry. That’s a once‑in‑a‑career opportunity for those excite…
Skills: Thermal-hydraulic modelling, Fluid dynamics, Python, Safety case authorship, Verification and validation
Derby, England, United Kingdom · Hybrid
$51k–$67k/yr
Role Title: Senior Engineer - Containment Analysis We are Rolls-Royce SMR and we’re doing something that’s never been done before. We’re revolutionising an industry. That’s a once‑in‑a‑career opportunity for those excite…
Skills: Thermal-hydraulic modelling, Fluid dynamics, Python, Safety case authorship, Verification and validation
Derby, England, United Kingdom · Hybrid
$51k–$67k/yr
Role Title: Senior Engineer - Thermofluids Model Validation We are Rolls-Royce SMR and we’re doing something that’s never been done before. We’re revolutionising an industry. That’s a once-in-a-career opportunity for tho…
Skills: Fluid Dynamics, Thermal Processes, RELAP, Flomaster, Vipre
Warrington, England, United Kingdom · On-site
$16/hr–$19/hr
Role: Fitter Location: Warrington, WA1 4RZ Hours: 37 hours per week | between 06:00 - 15:30 Monday to Thursday Hourly rate: between £16.66 - £19.10 ph DOE Are you a hands-on problem solver with a passion for precision an…
Skills: Mechanical Assembly, Hydraulic Fitting, Pneumatic Systems, Engineering Drawing Interpretation, Problem Solving
Derby, England, United Kingdom · Hybrid
$60k–$79k/yr
Location: Flexible (UK-based, hybrid working with travel to Warrington, Derby and Manchester as required) Our Mission At Rolls-Royce SMR, we are delivering one of the UK’s most ambitious clean energy programmes. Our Smal…
Skills: Systems Engineering, Containment Systems Design, Severe Accident Management, Requirements Management, Design Substantiation
Warrington, England, United Kingdom · On-site
Company Description Stannah is a family-owned manufacturing and engineering company. Our products move people and goods in and around homes and buildings. We make life easier for people. We do this by improving access fo…
Skills: Administration, Workforce Coordination, Project Delivery, Customer Service, Data Reporting
Warrington, England, United Kingdom · Hybrid
Company Description 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 stakehold…
Skills: Plant Layout Engineering, Piping Design, 3D CAD/BIM, Systems Engineering, Multidisciplinary Integration
Derby, England, United Kingdom · Hybrid
$71k–$93k/yr
Location: Flexible (UK) – with regular collaboration across Derby, Warrington and Manchester Our Mission At Rolls-Royce SMR, we are redefining the future of clean energy. Our small modular reactor technology will provide…
Skills: Reactor Core Design, Thermal Hydraulics, Fuel Performance, Nuclear Engineering, Team Leadership
Derby, England, United Kingdom · Hybrid
$71k–$93k/yr
Location: Flexible (UK – with regular travel to Derby, Warrington and Manchester) Our Mission At Rolls-Royce SMR, we are transforming the future of clean energy. Our small modular reactor technology will provide affordab…
Skills: Nuclear Core Design, Physics Analysis, Systems Engineering, Technical Governance, Programme Management
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Deliver mechanical work scopes including detailed design work packs and the supervision of designers for layout and detailed drawings. Support the project through all phases, including testing, execution, and the compilation of technical files for machinery compliance.
Requires extensive experience in highly regulated industries, preferably nuclear, with a strong understanding of Design for Assembly and UK CA compliance. Must be proficient in mechanical calculations, fabrication processes, and capable of attaining UK security clearance.
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.
Senior Mechanical Engineer
Location: Warrington
Type: Staff / Contract (Inside IR35)
Role Description
🔧 The Mechanical Senior Engineer is required to deliver the mechanical work scope, including production and checking, reporting to a Principal Engineer.
🛠️ They will need to deliver detailed design work packs and supervise designers in the production of layout and detailed design drawings.
🚀 The project is in the latter stages of preliminary design with mock-up parts, with certain assemblies in final manufacturing and testing.
👷 The Mechanical Senior Engineer will be required to support the design through all project phases, testing, and execution of the parts required in this current phase.
🤝 They will work closely with the multi-discipline design team and plant-based team.
📋 The role includes guiding Mechanical Designers and Engineers in the production of detail drawings, sub-assemblies, GA, layout drawings, flow diagrams, and parts lists.
📐 May be required to produce calculations to verify detailed design and design substantiation.
📁 The production and compilation of technical files for machinery/UK CA compliance (e.g., RA’s, O&M manuals, etc.) will also be a requirement.
Essential Experience & Qualifications
✅ Experience of working within a highly regulated industry, preferably within the nuclear industry.
🛠️ Familiarity with ‘Design for Assembly’ within a nuclear facility.
📈 Ability to manage own workload and drive the completion of the work scope.
📘 Strong understanding of delivering mechanical designs in the nuclear sector.
📂 Experience in producing technical files (UK CA and machinery directive compliance).
🛡️ Knowledge of machining and fabrication manufacturing processes.
📊 Experience in producing and checking mechanical engineering calculations and deliverables.
🤝 Skilled in liaising with key stakeholders and other design disciplines.
✍️ Competent report writing skills for clear and concise findings.
⏳ Comfortable working under time and cost constraints.
💬 Excellent communication skills with team members and the Client.
Due to the nature of work to be undertaken applicants will be required to meet certain residency criteria in order to attain a minimum level of UK security clearance if not already security cleared to a minimum SC level.
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.
Assystem, one of the world's leading independent nuclear engineering companies, is committed to accelerating the energy transition. We see ourselves as an activist in the development of nuclear energy, convinced that it is an essential part of the fight against climate change. 8,000 switchers, spread in 13 countries in Europe, Asia, Africa and the Middle East are working every day to make the energy switch by accelerating the development of nuclear and renewable energies, power grids, clean hydrogen projects and low-carbon transport. We design and supervise major projects through our engineering activities and accelerate our customers' digital transformation. We also develop new solutions to build faster and improve the performance of complex infrastructures. 59 years of experience have made Assystem a key partner of the world's largest industrial groups: CEA, EDF, ENEC, Enedis, Engie, Framatome, ITER, K.A. CARE, Naval Group, NICDC, Orano, RATP, Rolls Royce, Royal Commission, Sellafield, SNCF... Assystem is ranked in the Top 3 companies in the nuclear energy sector.
Offices: 11, Allée de l'arche, Tour Egée, Courbevoie, Ile-de-France 92400, FR · 6998 King Fahd Rd, 4540, Al Olaya, Riyadh 12331, Arabie saoudite, Al Olaya, SA · Olaya, Al Khobar 31952, Arabie saoudite, Al-Khobar, 31952, SA · 161 Castlereagh Street, Sydney, AU · Omar Ibn El Khattab, Intercontinental CityStar Hotel, 2ème étage, Le Caire, 11757, EG
There are currently 92 open manufacturing positions in Warrington, United Kingdom listed on Clera. New openings are added daily as companies post roles.
Companies currently hiring include Rolls-Royce SMR, Amentum, Assystem, B&R Industrial Automation, EMR, among others. Browse the listings above to see every active employer.
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