Site Delivery Lead - Civils in Leiston

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 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: Lead delivery of a major section of the Sizewell C programme—one of the UK’s largest infrastructure and nuclear new-build projects. This role supports safe, timely, and efficient delivery of capital works across the Main Development Site, contributing directly to the UK’s Net Zero ambitions.

Purpose: Reporting to the Site Delivery Director, you will provide leadership across a multi-discipline area of the site, acting with delegated Principal Contractor responsibility. You will oversee Senior Managers and matrix teams delivering Enabling Works, Major Civils, Networks, and Buildings, ensuring compliance, performance, and integration across programmes and alliances.

Key Accountabilities:

• Lead cross-programme planning with Civil Works, Nuclear Island, Conventional Island, and alliance partners.
• Ensure resource planning, recruitment, and SQEP compliance.
• Direct teams to deliver against the Programme Execution Plan.
• Maintain strong stakeholder communication and execution of site strategies.
• Drive safety, quality, schedule, cost control, and earned value management.
• Manage risks, issues, interfaces, and programme changes.
• Ensure schedule integrity, delivery of the List of Deliverables, and continuous improvement.
• Fulfil delegated Principal Contractor obligations under CDM.
• Support lessons learned, knowledge capture, and best-for-project decision-making.
• Manage NEC/FIDIC contracts and commercial performance.
• Build effective relationships across all project teams.

What You Will Need:

• Proven delivery leadership within complex, highly regulated environments—ideally nuclear.
• Strong background in heavy civils, reinforced concrete, formwork systems, and major structures.
• Experience with EPCM delivery, contract strategies, procurement, and commercial close-out.
• Robust project controls capability (risk, schedule, change, EV).
• Experience working under ONR/EA/nuclear site licence regimes and safety culture principles.
• Competent with estimating, scheduling, risk tools, and major construction contract management.
• Effective communicator with strong influencing, organisational, and analytical skills.
• Understanding of EPR design highly desirable.

Qualifications:

• Degree in Civil/Structural Engineering or Construction Management.
• Chartered Engineer (ICE/IStructE/CIOB) preferred.
• Project management accreditation (APM, PRINCE2) beneficial.
• Full lifecycle project management experience and knowledge of nuclear-grade quality standards.

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. If you require further support or reasonable adjustments with regards to the recruitment process, please contact matt.jones1@global.amentum.