Mechanical Responsible Engineer in Warrington

Company Description

Assystem is an international company with one mission: accelerate the energy transition around the world. Every day, our 8,000 switchers located in 12 countries (Europe, Middle East, Pacific Asia & Africa) connect their six thousand billion neurons to tackle the task of the century: switching to low-carbon energy. We are a collective committed to the actors who are making the energy switch. Sharing our knowledge, expertise and values allows us to innovate and think differently about the energy transition. Drawing on more than 55 years' experience in highly regulated sectors subject to strict security and safety requirements, we provide our customers with engineering and project management services, as well as digital services and solutions to optimize the performance of complex infrastructure projects throughout their life cycle. The Group is currently ranked second in the world for nuclear engineering. To ensure a viable, efficient, and reliable energy future for all.

Job Description

Mechanical Responsible Engineer - Warrington - Perm or Contract (Inside IR35)

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.

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.

Qualifications

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.

Additional Information

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. 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.