Mechanical Responsible Engineer

At Amentum, we're not just solving problems; we're engineering the future. Our team is driven by an unyielding commitment to innovation, integrity, and collaboration, tackling some of the most significant challenges in science, security, and sustainability. 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 offer an exciting range of opportunities to develop your career within a supportive and diverse 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.

About the Opportunity

The Decommissioning Alliance (TDA) is a strategic partnership, operating within the DNWP framework and delivering critical decommissioning work at Sellafield, including the UK’s most challenging Legacy Ponds facilities. As a key partner within DNWP, TDA contributes to Sellafield Ltd.’s mission while ensuring communities, supply chains, and stakeholders benefit from meaningful, measurable Social Value outcomes.

TDA now have an exciting opportunity for an experienced Mechanical Responsible Engineer with site experience of supporting the Retrievals East River programme within the TDA. This role would be working closely with both client and supply chain. This is an exciting opportunity to become part of an established team working on an emerging project at Sellafield. This role offers the chance to work in a dynamic and forward-thinking environment to deliver a project of national importance. The successful candidate will work closely with the Project Engineering Manager, multi-disciplinary project teams, and the Client on a fast- paced project.

Responsibilities will include:

• Ensure all plans, drawings, and quantities are accurate and suitable for engineering calculations.
• Manage and control design documentation, including drawings and technical specifications.
• Maintain configuration control of engineering deliverables.
• Liaise with Sellafield (SL) designers and other discipline teams to ensure compliance with design and construction regulations.
• Provide regular progress reports and updates.
• Plan and prioritise work effectively, adapting to setbacks and resolving technical challenges as they arise.
• Use AutoCAD, Navisworks, and 3D scanning software proficiently to enable accurate transfer of site data to the design team.
• Provide input and technical support as required for Design and Constructability Reviews.

Here’s What You’ll Need:

• Hold an HNC/HND in Mechanical Engineering (or equivalent qualification).
• SQEP RE role or equivalent
• Demonstrate strong plant knowledge and experience working within an operational environment.
• Have working experience using CIMAGE on the SL System.
• A positive can-do attitude, excellent communication and collaboration skills with the ability to work effectively across diverse project teams.
• Must hold or be able to obtain appropriate Security Clearance (SC and British Sole National) and be a Sellafield pass holder

Our Culture

Our values stand on a foundation of safety, integrity, inclusion and diversity. We put people at the heart of our business, and we genuinely believe that we all succeed by supporting one another through our culture of caring. We value positive mental health and a sense of belonging for all employees.

We aim to embed inclusion in everything we do. We know that if we are inclusive, we’re more connected, and we’re more creative. We accept people for who they are, regardless of age, disability, gender identity, gender expression, marital status, mental health, race, faith or belief, sexual orientation, socioeconomic background, and whether you’re pregnant or on family leave. This is reflected in our wide range of Global Employee Networks.

We partner with VERCIDA to help us attract and retain diverse talent. For greater online accessibility, please visit to view and access our roles. As a Disability Confident employer, we will interview all disabled applicants who meet the minimum criteria for a vacancy. We welcome applications from candidates who are seeking flexible working and from those who may not meet all the listed requirements for a role.

If you require further support or reasonable adjustments with regards to the recruitment process (for example, you require the application form in a different format), please contact

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