ASSYSTEM

Engineering services for design, construction, commissioning

Mechanical Responsible Engineer

Mechanical EngineeringConfirmed live in the last 24 hours

Full-timeWarrington, UKNo salary listed

About the Job

Requirements

A strong mechanical engineering background in regulated, safety-critical environments.
Proven technical accountability and decision-making experience.
A degree or equivalent in Mechanical Engineering or a related discipline.
Extensive experience aligned to a Responsible Engineer role.
Chartered Engineer status, or equivalent, with a recognised 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.
Experience delivering the full lifecycle from concept through commissioning and handover.
Experience managing deviations, concessions, and non-conformances.
A 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 and safety case considerations.
Expertise in the Machinery Directive and machinery design.
Knowledge of UKCA marking for new facilities.
Familiarity with SEMs, Design Capability CoE, and organisational structures.
SQEP aligned with SR0699 and ED21 standards.

Responsibilities

Hold full technical accountability for mechanical and ventilation engineering within the assigned area, ensuring work is safe, compliant, and fit for purpose across the project lifecycle.
Provide technical leadership, governance, and assurance in accordance with R2A2 (ED21), retaining responsibility for key engineering decisions even when delegated.
Ensure compliance with legislation, standards, and safety requirements.
Establish governance, assurance, and verification processes.
Lead multidisciplinary teams and resolve complex technical issues.
Manage technical risks effectively.
Interface with project teams, regulators, and assurance bodies.
Promote a strong safety, quality, and compliance culture.

Job Description

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. 

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.

About the Company

ASSYSTEM

Engineering services for design, construction, commissioning

Assystem provides engineering services for complex projects, covering design, construction, supervision, commissioning, and operation, with a strong focus on the nuclear and energy sectors. Its approach combines multidisciplinary engineering teams and project-management capabilities to move projects from initial concept through to operation. The company differentiates itself through a long track record, strategic acquisitions (including Alphatem in 1995 and Mactech Energy Group in 2025) and an early public offering in 2013, which have expanded its capabilities and market reach in the energy and nuclear fields. Its goal is to be a leading, reliable partner for clients by delivering end-to-end engineering services and helping them meet safety, performance, and regulatory requirements across the project lifecycle.

Company size: 5,001-10,000
Company stage: IPO
Headquarters: Paris, France
Founded: 1966

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