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. 

We are currently recruiting for a Senior Reactor Technologist to support the growth of our Advanced Reactors business across the UK and international nuclear markets.

This is a senior, client-facing role that combines deep technical expertise with commercial acumen and strategic business development. Working closely with the Operations Manager, you will contribute to the growth of Amentum's Advanced Reactors capability by developing client relationships, identifying new opportunities and leading technical delivery across a range of projects.

You will support clients throughout the development and deployment of advanced reactor technologies, providing technical advice and delivering consultancy services across the nuclear sector.

This is an exciting opportunity to play a leading role in one of the fastest-growing areas of the global nuclear industry The role offers the opportunity to work with reactor developers, utilities, government organisations, regulators and other industry stakeholders on the deployment of advanced nuclear technologies.

This role can be based in our Warrington, Manchester or Knutsford office

Key Responsibilities

Business Development & Client Engagement

• Support the Operations Manager in developing and delivering the Advanced Reactors growth strategy.

• Build and maintain relationships with clients across the UK and international markets.

• Identify emerging market opportunities and convert these into sustainable business growth.

• Contribute to market strategy through awareness of industry developments and emerging technologies.

• Support proposal preparation, bid activities and client presentations.

• Represent Amentum as a recognised industry leader at industry events, technical forums and conferences.

• Collaborate across Amentum's global business to develop integrated client solutions.

Technical Leadership

• Act as a recognised technical authority across advanced reactor technologies.

• Lead technical consultancy assignments including technology assessments, owner's engineer services, independent technical reviews, feasibility studies and strategic advisory work.

• Advise clients on reactor technology selection, deployment strategies, licensing, safety, operations and lifecycle considerations.

• Provide expert advice into reactor technologies including:

  • Generation III/III+ reactors

  • Small Modular Reactors (SMRs)

  • Advanced Modular Reactors (AMRs)

  • Generation IV reactor systems

  • High Temperature Gas Reactors (HTGR)

  • Molten Salt Reactors (MSR)

  • Sodium, Lead and Gas Fast Reactors

  • Microreactors

  • Ensure technical excellence and quality across project delivery.

  • Mentor and develop the next generation of reactor specialists within Amentum.

Essential Qualifications & Experience

• Degree in Nuclear Engineering, Mechanical Engineering, Physics or a related engineering discipline.

• Chartered Engineer (CEng) or equivalent professional registration

• Significant experience (typically 15+ years) in the nuclear industry.

• Experience across reactor technologies and deployment programmes.

• Strong understanding of reactor design, licensing, safety assessment, operations and nuclear regulation.

• Experience delivering technical consultancy or advisory services.

• Commercial awareness with the ability to align technical solutions with client and business objectives.

• Excellent written, verbal and presentation skills.

Desirable Experience

• Experience working with international reactor vendors or nuclear utilities.

• Knowledge of UK, US and international regulatory frameworks.

• Experience supporting new nuclear deployment programmes.

• Established professional network within the advanced reactor sector.

• Experience working with government organisations, investors or reactor developers.

• International project delivery and business development experience.

Personal Attributes

• An experienced reactor technologist with strong technical credibility.

• Passionate about advancing the deployment of next-generation nuclear technologies.

• Commercially aware and able to identify opportunities to support clients.

• Comfortable working with senior stakeholders across industry and government.

• An effective communicator, able to explain complex technical topics clearly.

• Collaborative, proactive and client-focused.

Why Join Us?

• Opportunity to work on high-profile civil and defence nuclear programmes, shaping the UK’s clean energy future.

• Be in control of your work- life balance.

• Collaborative culture where your ideas and input make a tangible difference.

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 Gillian.Calderwood@global.amentum.com