NSA Contract Project Manager - Plant Integration in London

At Amentum, we are driven by an unyielding commitment to innovation, integrity, and collaboration, tackling significant challenges in science, security, and sustainability. If you are 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. We believe that success comes from continuously pushing boundaries and working together to deliver on our promises.

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 would 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 are happy to discuss hybrid, part-time, and flexible working hours, patterns, and locations to suit you and our business.

About the opportunity: Join the Sizewell C project—one of the UK’s largest infrastructure and nuclear new-build programmes—helping deliver the engineering design replicated from Hinkley Point C. This role manages the Nuclear Services Agreement (NSA) contract with a focus on Plant Integration (PI), ensuring the contractor delivers design, configuration, 3D model, and data integration activities to the required cost, schedule, and quality.

You will be the primary SZC counterpart managing NSA PI scope, working closely with Engineering Integration as key stakeholders. The role combines contract management, technical oversight, and delivery assurance, ensuring clear expectations, robust commercial control, and timely resolution of engineering issues across the PI domain.

• Oversee execution of PI services within the NSA contract.
• Manage Early Warnings, risks, Compensation Events, and Variations with the NSA Commercial team.
• Challenge scope, assess value, and act as gatekeeper for Task Orders and change requests.
• Escalate commercial or delivery issues appropriately.
• Own end-to-end PI scope within the NSA team, ensuring deliverables meet contract requirements across: replication and configuration, 3D model strategy and updates, data/tools integration (CTS, Switch, etc.), engineering product integration.
• Ensure SZC provides timely inputs and performs review/acceptance activities.
• Maintain consistency of PI scope across Engineering Integration, Delivery Programmes, and related contracts.
• Build strong relationships with Engineering Integration and Contractor discipline leads.
• Act as trusted contractual counterpart to the NSA Contractor.
• Interface across Technical Directorate, Programme Engineering Managers, and Nuclear Services teams.
• Represent NSA in relevant forums and reviews.
• Report technical, financial, and schedule performance for PI scope.
• Capture and communicate impacts to baselines and budgets.
• Contribute to SZC monthly reporting and reinforce NSA obligations where needed.

• Experience on major infrastructure projects (nuclear preferred).
• Strong contract management capability and familiarity with technical governance.
• Ability to resolve complex technical/contractual issues and operate across multiple workstreams.
• Strong communication, stakeholder management, and organisational skills.
• Proactive, adaptable, able to work independently or in a matrix team.
• Strong IT and MS Office skills.
• Degree in Engineering or Science (essential).
• Desirable: PMI or equivalent project management qualification.
• Knowledge of nuclear standards, EPR design, configuration management, and digital modelling tools.
• Understanding of major project commercial processes.
• French language skills beneficial.
• Experience on HPC advantageous.
• Experience in design/manufacturing/installation contract procurement.
• Chartered or working towards chartership.

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 are more connected, and we are 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 are 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. 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.