Principal Civil & Structural Engineer

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.

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
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.

We’re looking for a driven individual who embraces collaboration and diversity, and who shares our vision to create a secure and vibrant future by continuously reinventing, realising breakthroughs and taking on challenges with courage. 

Our goal is to support development of new nuclear technologies and to keep existing power stations operating safely, contributing to the UK’s Net Zero carbon target. 

And this is where you come in   
Your role will be to manage and deliver civil and structural engineering solutions to time, cost and quality on projects of varying sizes. If you’re familiar with project delivery, you’ll know that they have lots of moving parts and complexity, which is why you’ll be working alongside our Engineering Managers and Operations Managers to enable delivery of maximum value. 

People are at the heart of everything we do 
Central to the success of the role will be your people skills, building effective relationships and interacting with multiple internal and external stakeholders in multiple locations. 

You’ll also work closely with colleagues to support activities that offer the best service to the client.  Through your interactions, you’ll be able to gather useful intelligence on client needs and work with the team to deliver innovative solutions. 

You’ll utilise your strong communication and engagement skills to achieve client, people and business outcomes, working with your team and peers that are based in different locations across the UK. 

We’re continuously evolving and growing the business, so there’s plenty of opportunity to evolve and grow your skills and career too. 

This role will be based at one of our Energy offices (London, Newcastle, Warrington, Bristol, Gloucester or Knutsford). We put flexibility at the heart of what we do and we’re happy to consider flexible working patterns. Key responsibilities could include:

• 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.
• Build and manage client relationships and leverage those relationships to deliver continued opportunities and new business leads.

Skills and Qualifications (the following list outlines desirable skills and qualifications. While these attributes are valued, we understand that applicants may not possess all of them. We therefore encourage applications from individuals with relevant experience and potential):

• 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 or civil engineering principals, design tools and relevant guidelines, standards and practices (in particular American standards ACI, ASCE and AISC).
• Experience using finite element modelling software and associated post processing software, with experience in validation and verification of modelling tools and their outputs.
• Good knowledge of health and safety legislation and good practice.
• Understanding of the use of design tools within a BIM environment.
• UK Nuclear Licencing and Generic Design Assessment process experience is desirable.
• Excellent communication, leadership, and client engagement skills.
• Experience in shaping and influencing technical strategy, standards, and governance.
• Recognised as a subject matter expert within civil and structural engineering and committed to Continuous Professional Development.

Our Culture

Our values are built on a strong foundation of safety, integrity, and respect for every individual. People are at the heart of our mission, and we believe in supporting one another through a culture of care and collaboration.

We strive to create a workplace where everyone feels they belong and can thrive. Supporting mental wellbeing and fostering a sense of connection are essential to how we work.

When we embrace different perspectives and work together, we become more innovative, more agile, and more successful.

We partner with VERCIDA, for greater online accessibility please visit www.vercida.com to view and access our roles. 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 (for example, you require the application form in a different format), please contact the team.
#ETS

       

Compensation Details:

GBP

       

The compensation range or hourly rate listed for this position is provided as a good-faith estimate of what the company intends to offer for this role at the time this posting was issued. Actual compensation may vary based on factors such as job responsibilities, education, experience, skills, internal equity, market data, applicable collective bargaining agreements, and relevant laws.

 

Benefits Overview:

Our health and welfare benefits are designed to support you and your priorities. Offerings include:

• Health, dental, and vision insurance

• Paid time off and holidays

• Retirement benefits (including 401(k) matching)

• Educational reimbursement

• Parental leave

• Employee stock purchase plan

• Tax-saving options

• Disability and life insurance

• Pet insurance

 

Note: Benefits may vary based on employment type, location, and applicable agreements. Positions governed by a Collective Bargaining Agreement (CBA), the McNamara-O'Hara Service Contract Act (SCA), or other employment contracts may include different provisions/benefits.

       

Original Posting:

05/13/2026 - 07/20/2026

Amentum anticipates this job requisition will remain open for at least three days, with a closing date no earlier than three days after the original posting. This timeline may change based on business needs.

       

Amentum is proud to be an Equal Opportunity Employer. Our hiring practices provide equal opportunity for employment without regard to race, sex, sexual orientation, pregnancy (including pregnancy, childbirth, breastfeeding, or medical conditions related to pregnancy, childbirth, or breastfeeding), age, ancestry, United States military or veteran status, color, religion, creed,  marital or domestic partner status, medical condition, genetic information, national origin, citizenship status, low-income status, or mental or physical disability so long as the essential functions of the job can be performed with or without reasonable accommodation, or any other protected category under federal, state, or local law. Learn more about your rights under Federal laws and supplemental language at Labor Laws Posters.