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.
Job DescriptionMechanical Responsible Engineer
Warrington
Perm or Contract (Inside IR35)
Mechanical Responsible Engineer (RE) ⚙️
The RE holds full technical accountability for mechanical & ventilation engineering within their area, ensuring all work is safe, compliant, and fit for purpose across the project lifecycle 🔍.
Working to R2A2 (ED21), you’ll provide technical leadership, governance, and assurance, while retaining responsibility for key engineering decisions—even when delegated 👷♂️.
Key Responsibilities & Experience:
- Strong mechanical engineering background in regulated, safety-critical environments ⚠️
- Proven technical accountability & decision-making experience ✅
- Ensure compliance with legislation, standards, and safety requirements 📜
- Establish governance, assurance & verification processes 🧩
- Lead multi-disciplinary teams & resolve complex technical issues 🤝
- Manage technical risks effectively ⚡
- Interface with project teams, regulators & assurance bodies 🏢
- Promote a strong safety, quality & compliance culture 🛡️
Essential Qualifications 🎓
- Degree (or equivalent) in Mechanical Engineering or related discipline ⚙️
- Extensive experience aligned to a Responsible Engineer role 🏗️
- Chartered Engineer (or equivalent) with a recognised institution 👨🔧
- Able to meet security clearance & site access requirements 🔐
Key Experience 💼
- Experience as a Responsible Engineer or technical authority in nuclear/high-hazard environments ☢️
- Safety case development, substantiation & regulatory engagement 📊
- Full lifecycle delivery: concept → commissioning & handover 🔄
- Managing deviations, concessions & non-conformances ⚠️
- Strong understanding of governance, assurance & gated processes 🧩
- Contribution to strategic decision-making & continuous improvement 📈
Specialist Knowledge ⭐
- SQEP in high-integrity piping design (incl. seismic & safety case) 🔩
- Machinery Directive & machinery design expertise ⚙️
- UKCA marking for new facilities 🇬🇧
- Familiarity with SEMs, Design Capability CoE & organisational structures 🏢
- SQEP aligned with SR0699 & ED21 standards 🎯
Whilst we encourage applications from all nationalities, Assystem within the UK are subject to security and export control restrictions due to the nature of work to be undertaken.
These restrictions mean that factors including your nationality, any previous nationalities you have held, and/or your place of birth may limit those roles that you can perform for the organisation.
NOTICE TO CANDIDATES ON RECRUITMENT FRAUD - We are committed to safeguarding candidates from fraudulent activity associated with our recruitment process. Please note that we will never offer specialist CV writing services, request payment or ask for sensitive personal information during the recruitment process.
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.
Skills Required
- Degree or equivalent in Mechanical Engineering or a related discipline
- Extensive experience aligned with a Responsible Engineer role
- Chartered Engineer status or equivalent with a recognized institution
- Ability to meet security clearance and site access requirements
- Experience as a Responsible Engineer or technical authority in nuclear or high-hazard environments
- Experience with safety case development, substantiation, and regulatory engagement
- Full project lifecycle delivery experience from concept through commissioning and handover
- Experience managing deviations, concessions, and non-conformances
- Strong understanding of governance, assurance, and gated processes
- Experience contributing to strategic decision-making and continuous improvement
- SQEP in high-integrity piping design, including seismic design and safety case requirements
- Machinery Directive and machinery design expertise
- UKCA marking knowledge for new facilities
- Familiarity with SEMs, Design Capability Centres of Excellence, and organizational structures
- SQEP aligned with SR0699 and ED21 standards
What We Do
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. 7,000 switchers, spread in 12 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. 55 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, SGP, SNCF... Assystem is ranked in the Top 3 companies in the nuclear energy sector.
