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Principal Mechanical Engineer, Stockton-on-Tees
Client: Amentum
Location: Stockton-on-Tees, United Kingdom
Job Category: Other
EU work permit required: Yes
Job Reference: 0ece7f8cbe58
Job Views: 25
Posted: 12.08.2025
Expiry Date: 26.09.2025
Job Description:
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 and 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 incorporates matched-funding, paid volunteering time, and charitable donations.
About the Opportunity
Amentum is recruiting a Principal Mechanical Engineer to join our Energy business, supporting UK nuclear fleet transformation and 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 to meet project goals, working closely with Operations and Engineering Managers to maximize value. The position can be based at one of our Energy offices (Newcastle, Warrington, Glasgow, Gloucester, Stockton, Bristol, or Knutsford), with flexible working arrangements considered.
Responsibilities:
* Own technical challenges, develop strategies, and implement solutions with stakeholders.
* Deliver technical analysis and design solutions.
* Produce and review design documents, specifications, and calculations.
* Collaborate with international SMR developers for regulatory assessments.
* Justify design decisions to the ONR.
* Fulfill CDM responsibilities.
Minimum Qualifications:
* MEng, MSc, BEng, or BSc in Mechanical Engineering or relevant field.
* Experience in heavy infrastructure, nuclear, or regulated industries.
* Chartered status or working towards it (e.g., IMechE, MIET).
* Experience with American codes and designing pumps, valves, heat exchangers, tanks, filters, HVAC equipment, and authoring datasheets.
* Proficiency with CAD software (AutoCAD, Inventor, Creo, SolidWorks).
* Experience with technical drawings (BS EN 8888) and Piping & Instrumentation Diagrams.
* Familiarity with safety cases in industrial environments.
* Knowledge of UK Nuclear Regulatory processes is desirable.
Our Culture
We prioritize safety, integrity, inclusion, and diversity. We support a culture of caring, positive mental health, and belonging. We promote inclusion and diversity through our policies and partnerships, including VERCIDA, and are a Disability Confident employer. We welcome applications from candidates seeking flexible working or who may not meet all listed requirements.
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