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Amentum Logo Amentum · IT - Administration

Principal Mechanical Engineer

United Kingdom, Risley Employment contract · Job Posted June 30, 2026
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Job Description

Amentum will 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.

Job Responsibility

  • Take ownership of technical challenges, develop a strategy and implement the solution through engagement with internal and external stakeholders
  • Deliver technical solutions (analysis and design)
  • Produce and review design deliverables (assumption notes, technical specifications and calculation notes, methodology plans etc)
  • Work with international SMR developers to pass through the Office of Nuclear Regulation's Generic Design Assessment process
  • Review and justify design decisions to the ONR
  • Fulfil and take ownership of CDM responsibilities

Requirements

  • MEng, MSc, BEng or BSc in Mechanical Engineering or other relevant degree level qualification
  • Experience in relevant field of design of heavy infrastructure projects, nuclear or regulated industry
  • Chartered with relevant institution (e.g., IMechE, MIET) or working towards Chartership
  • Ability to work within a design team, and also able to collaborate within multi-disciplinary teams
  • Previous experience in the design and/or construction of engineering solutions using American codes
  • Experience of designing pumps, valves, heat exchangers, tanks, filters or HVAC equipment as well as authoring datasheets
  • Experience with CAD software AutoCAD, Inventor, Creo or Solidworks
  • Experience with authoring technical drawings to BS EN 8888 and Piping & Instrumentation Diagrams
  • Familiar with safety cases in industrial enviroments

Nice to have

  • Experience with Matlab and MathCAD would be beneficial
  • Experience writing test plans for Equipment Qualification
  • Knowledge and understanding of UK Nuclear Regulatory process in field of mechanical engineering is desirable

What we offer

  • 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
  • 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
  • reimbursement towards relevant professional development and memberships
  • matched-funding, paid volunteering time and charitable donations
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