Principal Civil Structural Engineer

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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.

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. 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.

Amentum is currently recruiting for a Principal Civil and Structural Engineer to join our Energy business, which is entering an exciting phase of opportunity: supporting a key client’s UK nuclear fleet through a business transformation; supporting new small and advanced modular reactor developers. Our work is varied, covering nuclear projects (Licensing, New Build, Generation, Life Extension, and Defueling), Renewable Energy projects and high‑energy industrial projects, such as data centres and hydrogen production facilities.

In addition, we have opportunities across the wider business to help us to keep work interesting as you develop your career with us.

• Act as the Responsible Engineer and Technical Authority on major energy projects of varying sizes.
• Lead the definition of civil and structural engineering strategies, standards, and best practices across projects.
• Lead project delivery teams across the project lifecycle from bid generation, through concept and detailed design development to construction.
• Take accountability for delivery of complex civil and structural engineering packages to cost, time, and quality.
• Provide technical leadership, governance, and quality assurance for safety‑critical systems.
• Demonstrate knowledge of the practical aspects of implementing engineering designs and understand the use of standards and compliance with regulatory requirements in an engineering environment.
• Oversight, verification and leadership for preparation of safety case inputs, such as Safety Functional Requirements (SFRs), Structural Design Method Statements (SDMSs) and Design Substantiation Reports (DSR).
• Oversight, verification and leadership for the preparation of Interpretive Reports, Basis of Design, Analysis Reports, Calculations, CDM documentation, Material Specifications, Scopes of Work, and Technical Reports.
• Engage with clients, regulators, and industry bodies at a senior level, building and maintain valuable relationships.
• Mentor and develop the engineering capability of the wider civil and structural engineering team.
• Drive innovation, digital tools, and continuous improvement in engineering delivery.
• Support business development, proposals, and client relationship management.

• MEng, MSc, BEng or BSc or equivalent in civil engineering or another relevant discipline.
• Chartered Engineer status with a relevant professional body.
• Previous team leadership, line management, technical lead or Responsible Engineer experience.
• Extensive experience in civil and structural design and leadership within the nuclear sector or highly regulated environments.
• Deep knowledge of nuclear safety, regulation, and quality assurance processes.
• Knowledge of civil engineering…