Assystem
5001 - 10000 employees
💰 Post-IPO Equity on 2013-12
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.
Senior Mechanical Engineer
🕒 September 21, 2025
🇬🇧 United Kingdom – Remote
⏰ Full Time
🟠 Senior
🧑🔧 Mechanical Engineer
🇬🇧 UK Skilled Worker Visa Sponsor
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Assystem
5001 - 10000 employees
💰 Post-IPO Equity on 2013-12
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.
📋 Description
• Act as Intelligent Customer role: critically assess and ensure supplier deliverables meet requirements • Develop and review Process Flow Diagrams, Piping and Instrumentation Diagrams, Layout Drawings, Sizing Calculations, Datasheets, and Specifications • Lead and review optioneering studies, Decision Record Files, Design Descriptions, and Requirement Specifications • Apply Systems Engineering: develop and review Functional and Design Requirements • Integrate Turbine Island design into the wider power plant and manage interfaces • Serve as technical contact for Turbine Island interfaces and stakeholder activities • Participate in Design Reviews and HAZID/HAZOP studies with multidisciplinary teams • Liaise with safety team on nuclear safety licensing, environmental planning/permitting, and related activities • Ensure compliance with statutory H&S policies, project quality, and the Quality Management System
🎯 Requirements
• Previous work in nuclear, thermal power, oil and gas, or other regulated sectors • Experience with steam turbines, condensers, feedwater heaters, pumps, and piping systems • Strong background in thermal power systems, with experience from FEED to detailed design and EPC delivery • Skilled in developing procurement specifications and collaborating with equipment suppliers • Extensive technical experience in thermal power or similar projects • Excellent communication and stakeholder engagement skills • Ability to identify and manage critical interfaces on major projects • Proficient in UK Health and Safety regulations, safety systems, HAZOP, and engineering standards • Knowledge of ASME, European, and UK codes and standards • Experience or awareness of Systems Engineering is a plus • Bachelor’s degree or Higher National Diploma in engineering • Chartered Engineer (CEng) or working towards it • SC Security Clearance or ability to achieve it • Ability to handle sensitive nuclear information in line with export control obligations
🏖️ Benefits
• Attractive social benefits, including an engaging Employee Committee • Holiday bonuses • Ongoing training and numerous career opportunities • High internal promotion rate (70% of managers promoted internally) • Hybrid work: 1-2 days remote per week
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