Mechanical Responsible Engineer

PAE Government Services Inc.; Warrington; Hybrid; GBP 70,000 - 110,000; Full time

Benefits offered by this job

Free single medical cover

Digital GP service

Enhanced parental leave pay

Reimbursement towards professional dev

Job summary

Amentum in Warrington is seeking a Mechanical Responsible Engineer (RE) with accountability for mechanical and vent engineering within a nuclear or high-hazard environment. You will work under R2A2 governance, directing a multidisciplinary team to deliver safe, compliant outcomes across lifecycle.

The role requires Chartered Engineer status, significant experience in safety-critical projects, and the ability to engage regulators and assurance functions.

Qualifications

• Significant experience delivering mechanical engineering in regulated, safety-critical environments.
• Technical accountability for engineering scope and decisions.
• Experience ensuring compliance with legislation, standards and safety requirements.
• Ability to govern engineering activities and assurance arrangements.

Responsibilities

• Provide technical direction and governance to the engineering team throughout lifecycle.
• Ensure standards, assurance and safety are applied across projects.
• Collaborate with project managers, safety case owners, and operations.
• Support multiple tasks and projects across lifecycle stages.

Skills

Mechanical engineering

Technical leadership

Regulated environment

Safety-critical governance

Nuclear piping design

Stakeholder management

Problem solving

Education

Degree in Mechanical Engineering or related

Chartered Engineer status

Job description

At Amentum, we're not just solving problems; we’re engineering the future. Our team is driven by an unyielding commitment to develop your career within a supportive team who always strive to do the right thing for our people, clients and communities. People are our greatest asset, and we offer a competitive package to retain and attract the best talent.

In addition to the benefits you’d expect, UK employees also receive free single medical cover and digital GP service, family-friendly benefits such as enhanced parental leave pay and free membership of employee assistance and parental programmes, plus reimbursement towards relevant professional development and memberships.

Work-life balance and flexibility is a key focus area for us. We’re happy to discuss hybrid, part-time and flexible working hours, patterns and locations to suit you and our business.

If you're passionate about making a real impact and want to be part of a community that values ethical excellence, this is the place where your ambition can thrive. Here, we believe that success comes from continuously pushing boundaries and working together to deliver on our promises.

We embrace challenges with confidence and are dedicated to creating a secure and vibrant future for all. We’ll inspire and empower you to deliver your best work so you can evolve, grow and succeed – today and into tomorrow.

We are currently looking for a Mechanical Responsible Engineer (RE). This position may be based in Warrington, Westlakes Ind. Estate or Stockton-on-Tees.

Your role

The Mechanical Responsible Engineer (RE) holds overall technical accountability for the mechanical and vent engineering scope within their assigned area of responsibility. Operating in accordance with the Sellafield Ltd Roles, Responsibilities, Accountabilities and Authorities (R2A2) for Responsible Engineer (ED21), the RE is accountable for ensuring that engineering activities, decisions, and outputs are technically correct, safe, compliant, and fit for purpose throughout the lifecycle. The Responsible Engineer provides technical direction and governance to the engineering team, ensures appropriate standards and assurance arrangements are applied, and retains accountability for engineering decisions, including those delegated to Lead, Principal, Senior, or Design Engineers. Delegation of tasks does not remove accountability from the Responsible Engineer. The Responsible Engineer will work closely with Project Managers, safety case owners, operations, and assurance functions to ensure engineering outcomes are safe, compliant, and fit for purpose. The Responsible Engineer may support multiple tasks or projects concurrently and will contribute across different stages of the engineering lifecycle, depending on project needs.

Requirements

• Significant experience delivering and governing Mechanical engineering within a regulated, safety-critical environment.
• Demonstrable experience holding technical accountability for engineering scope, including decision-making and assurance.
• Experience ensuring compliance with applicable legislation, standards, safety requirements, and organisational procedures.
• Experience establishing and maintaining appropriate engineering governance, assurance, and verification arrangements.
• Experience leading and directing multi-disciplinary engineering teams through delegated authority.
• Experience managing and resolving complex technical issues and risks.
• Experience interfacing with project management, safety case, operations, regulators, and independent assurance functions.
• Demonstrated leadership in promoting a strong safety, quality, and compliance culture.
• Degree or equivalent qualification in Mechanical engineering, or a closely related engineering discipline.
• Extensive Mechanical engineering experience commensurate with a Responsible Engineer role.
• Chartered Engineer status with a relevant professional institution (or demonstrable equivalent).
• Ability to meet role-specific security clearance and site access requirements.
• Experience acting as a Responsible Engineer or equivalent technical authority within a nuclear or high-hazard environment.
• Experience supporting safety case development, substantiation, and regulatory engagement.
• Experience across the full engineering and project lifecycle, from concept through delivery, commissioning, and handover.
• Experience overseeing technical responses to deviations, concessions, and non-conformances.
• Familiarity with Sellafield engineering governance, assurance, and gated processes.
• Experience contributing to strategic engineering decision-making and continuous improvement.
• Extensive experience in Piping design specifically for high integrity nuclear pipework, seismic pipework design, piping safety case Strong experience in Machinery Directive, machinery design Good experience in UKCA marking, of new facilities Familiarisation of the Sellafield SEMs system and knowledge of the Design Capability CoE and org structure

Our Culture

Our values are built on a strong foundation of safety, integrity, and respect for every individual. People are at the heart of our mission, and we believe in supporting one another through a culture of care and collaboration. We strive to create a workplace where everyone feels they belong and can thrive. Supporting mental wellbeing and fostering a sense of connection are essential to how we work. When we embrace different perspectives and work together, we become more innovative, more agile, and more successful.

For more than 100 years, Amentum has tackled the world’s toughest challenges to deliver agile and steadfast solutions to the U.S. government and its allies. With more than 50,000 employees on all seven continents and in more than 60 countries, Amentum delivers a broad range of operational support services to meet the critical needs of our clients. Our headquarters are in Chantilly, VA. Find us online at https://www.amentum.com/

If you need a reasonable accommodation for any part of the employment process, please complete our Accommodation Request. Requests for accommodation will be considered on a case‑by‑case basis. If you need assistance, please reach out to [e-mail]

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