Mechanical Responsible Engineer

Assystem; Warrington; On-site; GBP 70,000 - 105,000; Full time

Job summary

Assystem in the United Kingdom is seeking a Mechanical Responsible Engineer to lead mechanical and ventilation engineering within a nuclear/high‑hazard project in Warrington. The role carries full technical accountability across the lifecycle, including safety, compliance and governance for engineering decisions.

Working to high-integrity standards, you will collaborate with project teams, regulators and assurance bodies, ensuring robust safety, quality and risk management while maintaining

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.

Responsibilities

• 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.

Skills

Mechanical engineering

Safety-critical environments

Technical accountability

Regulatory compliance

Governance & leadership

Stakeholder interface

Risk management

Education

Degree in Mechanical Engineering or related

Chartered Engineer

Job description

Job 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 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.

Mechanical 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

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.