Senior Project Manager - TOC Assurance, Heavy Civils

This is a senior client-side assurance and commercial governance role supporting major heavy civil infrastructure packages at Sizewell C. The position is focused on challenging and validating Target Outturn Cost (TOC) submissions, ensuring procurement strategies, cost estimates, risk allowances, and pre-construction planning are robust, auditable, and aligned with programme objectives.,

• Lead assurance reviews of TOC submissions across major heavy civils packages.
• Challenge cost estimates, risk allowances, pricing methodologies, and commercial assumptions.
• Review QSRA/QCRA analyses and ensure compliance with governance frameworks.
• Support procurement strategy, TOC development, contract reviews, and negotiations.
• Manage key stakeholder interfaces and lead assurance workshops and governance forums.
• Assess project risks, challenge contingencies, and validate value engineering and cost optimisation initiatives.
  
  Experience in major infrastructure/heavy civils.
• Strong background in pre-construction, estimating, procurement, quantity surveying, and commercial management.
• Experience reviewing and challenging TOC/target cost submissions.
• Working knowledge of QSRA/QCRA Monte Carlo risk analysis, contingency management, and cost planning.
• Understanding of NEC/PAA contracting models.
• Ability to lead assurance reviews, stakeholder engagement, and governance forums.
• Tier 1 contractor, consultancy, or major project delivery background.
• Degree-qualified in QS, Commercial Management, Civil Engineering, or similar.
• MRICS or equivalent professional accreditation desirable.
  
  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 Nuclear Power Programmes has been formed with the vision to support positive change and help shape the future of Nuclear Power. Operational throughout the UK and across continental Europe, we are seeking to expand our team on a variety of nuclear projects, which range in technologies and that find themselves at different stages of their development. To do this, we are seeking to continuously employ talented individuals to join our diverse team that are excited about nuclear projects and are committed to Net Zero, and Energy Security. In both client facing and internal roles we are delivering major programme and project management capabilities throughout the project lifecycle. We are driving to deliver safe, high quality and to time solutions by thinking innovatively and working collaboratively.