Senior Quantity Surveyor

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 team who always strive to do the right thing for our people, clients and communities.

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.

The Senior Quantity Surveyor will provide 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.

• A high emphasis on subcontract engagement
• Support cost estimation, budgeting, and forecasting activities across decommissioning projects.
• Administer contracts (e.g., NEC3/4) including change control, payment applications, and final accounts.
• Support procurement and tendering processes with accurate cost data and commercial input.
• Monitor and report on project financial performance, identifying risks and opportunities.
• Ensure compliance with regulatory and governance frameworks including NDA and ONR requirements.
• Engage with project teams, suppliers, and stakeholders to ensure commercial alignment.
• Contribute to continuous improvement and lessons learned in cost and contract management.

This role will requires 2-3 days a week on site every other week at Sellafield or DNWP Site Office at Ullcoats, Cumbria (tbc.)

• Degree level qualification in relevant discipline or equivalent experience in commercial /contract management
• MRICS or recognised equivalent professional membership (consideration will be given if this process has started with a detailed and dedicated plan for completion)
• Worked within a highly regulated and quality assured system where design and engineering was a major part of the role.
• Ability to provide leadership in a key area within an engineering function and act as a custodian of resource and expertise.
• Commercial experience demonstrating a record of successful delivery, including positions influencing professional engineers in the definition, implementation and delivery of engineering work packages.
• Ability to provide strategic guidance based on knowledge and experience of projects across a portfolio to inform and direct projects and programmes.
• Strong knowledge of NEC3 and NEC 4 contracts and public sector procurement regulations.
• Demonstrable experience in cost management, contract administration, and commercial reporting.
• Excellent stakeholder engagement and communication skills.
• Must be…