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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, free membership of employee assistance and parental programmes, plus reimbursement towards relevant professional development and memberships. We also give back to our communities through our Collectively program, which includes matched-funding, paid volunteering time, and charitable donations.
About the Opportunity
Amentum is recruiting a Principal Mechanical Engineer to join our Energy business, supporting a key client’s UK nuclear fleet through a business transformation, and aiding new small modular reactor developers. Our work covers Licensing, New Build, Generation, Life Extension, and Defueling, with demand across the nuclear sector.
Your role involves managing and delivering mechanical design solutions on projects of varying sizes, working alongside Operations and Engineering Managers to ensure maximum value delivery. The position is based at one of our Energy offices (Newcastle, Warrington, Glasgow, Gloucester, Stockton, Bristol, or Knutsford), with flexible working patterns considered.
Role responsibilities:
1. Take ownership of technical challenges, develop strategies, and implement solutions through stakeholder engagement.
2. Deliver technical solutions (analysis and design).
3. Produce and review design deliverables (assumption notes, technical specifications, calculation notes, methodology plans).
4. Work with international SMR developers to pass the Office of Nuclear Regulation’s Generic Design Assessment process.
5. Review and justify design decisions to the ONR.
6. Fulfill and take ownership of CDM responsibilities.
Minimum qualifications and experience:
* MEng, MSc, BEng, or BSc in Mechanical Engineering or relevant field.
* Experience in heavy infrastructure projects, nuclear, or regulated industries.
* Chartered status or working towards Chartership (IMechE, MIET).
* Ability to collaborate within multi-disciplinary teams.
* Experience with American codes in engineering design and/or construction.
* Design experience with pumps, valves, heat exchangers, tanks, filters, HVAC equipment, and datasheet authoring.
* Proficiency with CAD software (AutoCAD, Inventor, Creo, SolidWorks).
* Experience with technical drawings per BS EN 8888 and Piping & Instrumentation Diagrams.
* Familiarity with safety cases in industrial environments.
* Knowledge of Matlab and MathCAD is beneficial.
* Experience in writing test plans for Equipment Qualification.
* Understanding of UK Nuclear Regulatory processes in mechanical engineering is desirable.
Our Culture
Our values are safety, integrity, inclusion, and diversity. We prioritize supporting our people through a caring culture that promotes positive mental health and a sense of belonging. We embed inclusion and diversity in all we do, believing that diverse and inclusive teams are more creative and connected.
We partner with VERCIDA to attract and retain diverse talent. For greater accessibility, please visit our careers page. As a Disability Confident employer, we will interview all disabled applicants meeting minimum criteria. We welcome applications from candidates seeking flexible working or who may not meet all listed requirements.
If you require further support or adjustments during the recruitment process, please contact our team.
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