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.
About the Opportunity
Amentum is a key delivery partner within the Decommissioning and Nuclear Waste Partners (DNWP) Framework, a major Sellafield programme worth up to £ billion and running for up to 15 years. The framework is focused on safely accelerating decommissioning, remediation and high hazard risk reduction across one of the most complex nuclear sites in the world.
Our nuclear team supports the front end design, engineering, technical leadership and delivery expertise required across the DNWP portfolio. We are looking for individuals with high value expertise from across regulated and comparable sectors to who can work collaboratively, embrace new challenges and contribute to the mission of safely and efficiently delivering Sellafield’s decommissioning and nuclear waste objectives.
You'll provide expert Senior Quantity Surveying support across nuclear decommissioning projects, ensuring robust cost management, contract administration, and commercial governance. The role is critical in supporting safe, compliant and cost-effective delivery of complex decommissioning programmes.
As a Senior Quantity Surveyor, you would be responsible for supporting the Principle Commercial Manager(s) and programme leads in delivering the Contract Management Plans and maintaining the relationship with the Client, Contractors/Subcontractors, Suppliers or Service Providers for the relevant contracts. This would include the administration of the contract Risk Register, attending Risk Reduction and other Meetings, managing the Early Warning Notice and Compensation Event processes and CEMAR administration. All contracts will be managed in accordance with Amentum Management System and procedures for contract management. You will be responsible for ensuring compliance to procedures and Contract Terms and Conditions to secure delivery with certainty. Key Responsibilities:
1. A high emphasis on subcontract engagement
2. Support cost estimation, budgeting, and forecasting activities across decommissioning projects.
3. Administer contracts (, NEC3/4) including change control, payment applications, and final accounts.
4. Support procurement and tendering processes with accurate cost data and commercial input.
5. Monitor and report on project financial performance, identifying risks and opportunities.
6. Ensure compliance with regulatory and governance frameworks including NDA and ONR requirements.
7. Engage with project teams, suppliers, and stakeholders to ensure commercial alignment.
8. Contribute to continuous improvement and lessons learned in cost and contract management.
Here's What You'll Need
9. Degree level qualification in relevant discipline or equivalent experience in commercial /contract management
10. MRICS or recognised equivalent professional membership – consideration will be given if this process has started with a detailed and dedicated plan for completion
11. Previous QS experience, where knowledge of engineering was a key attribute.
12. Worked within a highly regulated and quality assured system where design and engineering was a major part of the role.
13. Ability to provide leadership in a key area within an engineering function and act as a custodian of resource and expertise.
14. Commercial experience demonstrating a record of successful delivery, including positions influencing professional engineers in the definition, implementation, and delivery of engineering work packages.
15. Ability to provide strategic guidance based on knowledge and experience of projects across a portfolio to inform and direct projects and programmes.
16. Proven experience as a Senior Quantity Surveyor in a regulated sector.
17. Strong knowledge of NEC3 and NEC 4 contracts and public sector procurement regulations.
18. Demonstrable experience in cost management, contract administration, and commercial reporting.
19. Excellent stakeholder engagement and communication skills.
20. Must be proficient in MS Office applications – especially MS Excel.
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.
We partner with VERCIDA, 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 the team.