Principal Mechanical Engineer

Amentum; Bristol; On-site; GBP 50,000 - 80,000; Full time

Job summary

A leading company in the nuclear sector is seeking a Principal Mechanical Engineer to support their UK nuclear fleet transformation. You will manage mechanical design solutions, requirement collaboration, and deliver technical analyses while contributing to innovative engineering projects. This role offers flexible working arrangements in a supportive team culture.

Benefits

Free single medical cover

Enhanced parental leave pay

Professional development reimbursement

Paid volunteering time

Qualifications

• Experience in heavy infrastructure projects or regulated industries.
• Chartered with IMechE or working towards.
• Experience with engineering solutions using American codes.

Responsibilities

• Manage and deliver mechanical design solutions within scope, budget, and schedule.
• Produce and review design deliverables like technical specifications and methodology plans.
• Collaborate with international SMR developers.

Skills

Project management

Stakeholder engagement

Technical analysis

Design solutions

Collaboration

Education

MEng, MSc, BEng, or BSc in Mechanical Engineering

Tools

AutoCAD

Inventor

Creo

SolidWorks

Job description

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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 attract and retain the best talent.

In addition to the benefits you’d expect, UK employees receive free single medical cover and digital GP services, family-friendly benefits such as enhanced parental leave pay, free membership of employee assistance and parental programs, plus reimbursement for 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 currently recruiting for a Principal Mechanical Engineer to join our Energy business, which is entering an exciting phase supporting a key client’s UK nuclear fleet transformation, and supporting new small modular reactor developers. Our work covers Licensing, New Build, Generation, Life Extension, and Decommissioning, with in-demand capabilities across the nuclear sector.

Your role will be to manage and deliver mechanical design solutions within scope, budget, and schedule on various projects. If you’re familiar with project delivery, you’ll know that projects involve many moving parts and complexities, requiring collaboration with Operations and Engineering Managers to maximize value.

This role will be based at one of our Energy offices (Newcastle, Warrington, Glasgow, Gloucester, Stockton, Bristol, or Knutsford). We prioritize flexible working arrangements and are open to flexible patterns.

Role responsibilities:

1. Take ownership of technical challenges, develop strategies, and implement solutions through stakeholder engagement.
2. Deliver technical analysis and design solutions.
3. Produce and review design deliverables such as assumption notes, technical specifications, calculation notes, and methodology plans.
4. Collaborate with international SMR developers to pass the Office of Nuclear Regulation’s Generic Design Assessment process.
5. Review and justify design decisions to ONR.
6. Fulfill and own 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 with IMechE, MIET, or working towards Chartership.
• Ability to work within a design team and collaborate across disciplines.
• Experience designing and/or constructing engineering solutions using American codes.
• Experience with pumps, valves, heat exchangers, tanks, filters, HVAC, and datasheet authoring.
• Proficiency with CAD software such as AutoCAD, Inventor, Creo, or SolidWorks.
• Experience creating technical drawings to BS EN 8888 and Piping & Instrumentation Diagrams.
• Familiarity with safety cases in industrial environments.
• Knowledge of Matlab and MathCAD is beneficial.
• Experience writing test plans for Equipment Qualification.
• Understanding of UK Nuclear Regulatory processes in mechanical engineering is desirable.

Our Culture

Our values are based on 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 foster greater creativity and connection.

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 who meet minimum criteria. We welcome flexible working requests and applications from candidates who may not meet all listed requirements.

If you need further support or reasonable adjustments during recruitment, please contact our team.