Rodeo
ResourcesPartnersSign in

Assystem

Principal Mechanical Engineer

Bolton
Posted 23 days ago
Sign up to applySee more jobs like this

How your CV stacks up

1Upload CV
2Analyse CV
3Improve CV

Upload your CV to see how well it fits this job role

?%

Principal Mechanical Engineer

Today, Assystem is among the top three independent nuclear engineering firms worldwide. With over 60 years of experience in highly regulated sectors, the group supports public and industrial stakeholders in the execution of complex and strategic infrastructure projects, subject to high safety and security requirements.

Assystem mobilizes 8,000 experts in 13 countries and intervenes across the entire project lifecycle, in engineering, project management and digital solutions.

Job Description

๐Ÿš€ Join the Fusion and Modular Nuclear Business Unit! ๐Ÿš€ Reporting to the FEED Engineering Manager you will be responsible for Delivering Front Engineering activities for Small Modular Reactors, Advanced Modular Reactors and Fusion projects. The Principal Engineer shall work closely with multi-disciplined teams and will deliver scope through leadership of an engineering design team.

Your mission:

Spearheading the delivery of cutting-edge power station systems! Taking charge of optioneering studies to pinpoint the ultimate solution that perfectly aligns with client objectives. Leading a dynamic team in crafting and refining essential design documents, from Process Flow Diagrams to Equipment Datasheets, ensuring precision and excellence at every step. Directing the development of Design Description Documents and Requirement Specifications, driving innovation and efficiency in every design aspect. Seamlessly integrating developed systems into the broader plant infrastructure for optimal performance and functionality. Serving as the technical guru for designated scopes, guaranteeing top-notch expertise and oversight. Chairing exhilarating Design Reviews and leading HAZID/HAZOP studies with diverse, multidisciplinary teams to ensure safety and excellence in every project facet. Enforcing strict adherence to company statutory H&S Policies and regulations, while ensuring unwavering compliance with project and Quality Management System standards. Why Join the Community of Switchers?

Reasons to use Rodeo

Iโ€™m in my final year doing Economics and I donโ€™t know whether to apply for grad schemes now or do a masters first. What do you think?

Honest answer โ€” it depends on where you want to end up. A lot of top grad schemes (Big 4, civil service, banking) donโ€™t need a masters. Letโ€™s look at the ones youโ€™d be competitive for now, and we can decide if a masters actually adds anything.

Also worth knowing: most autumn 2026 applications are open now. Timing matters more than you think.

Start with a chat, not a search bar

Grad scheme, placement, apprenticeship? Not sure what you want yet โ€” that's fine. Your agent talks it through with you and turns "I have no idea" into a shortlist.

P

Graduate Consultant โ€” 2026 Scheme

PwCยทLondon, UK
ยฃ35,000/yr

Why you're a good match

Strong

Your economics background and your summer at a regional bank line up with what PwC looks for on the consulting scheme. Applications close in four weeks.

See breakdown
Save jobNot relevant
View details

It searches the market for you

Every day your agent scans the market matching roles against what actually matters to you, not just keywords on a CV.

Why you're a good match

Youโ€™ve got the grades and the economics background, and your bank internship is exactly the experience this scheme looks for. Apply soon โ€” deadlines close within the month.

See breakdown
Strong

Experience fit

Your summer at the bank plus your econometrics coursework map directly to the day-one responsibilities on this scheme โ€” client modelling, market briefings, and deal support.

See breakdown
Strong

Only hits

No noise. No "maybe this fits." Just roles with a clear explanation of why they're right โ€” and where to focus when applying.

๐ŸŒŸ Over 55 years in nuclear engineering. ๐Ÿ† Ranked among the top 3 largest nuclear engineering companies. ๐Ÿ’ผ Attractive social benefits, including an engaging Employee Committee and holiday bonuses. ๐Ÿ“š Ongoing training with numerous career opportunities. ๐Ÿ“ˆ 70% of our managers are promoted internally! ๐Ÿ  Hybrid work: 1-2 days remote per week

Qualifications

Strong previous experience in highly regulated industries like nuclear, thermal power generation, or oil and gas. Expertise in thermal power systems and equipment, from steam turbines to pumps, with a keen understanding of nuclear power plant operations. Proficiency in optioneering and conducting studies to evaluate viable options, backed by a track record of crafting compelling ALARP and BAT arguments. Experience in mentoring and developing junior staff, along with a proven history of leadership in managing small teams. Exceptional communication skills for seamless interaction with internal and external stakeholders. Familiarity with ASME, European, and UK codes and standards, coupled with a deep understanding of Product Safety Legislation. Appreciation for requirements management and systems engineering principles. Results-oriented with the ability to work both independently and collaboratively, coupled with strong organizational skills. British National with eligibility for obtaining and maintaining full UK security clearance.

Get help with your application

Your very own career expert that helps elevate your application to the next level.

Get help applying for this job

Additional Information

Due to the nature of the work, applicants must meet UK security clearance criteria.

Ready to make a difference in the nuclear engineering world? Join us and be a part of the future of nuclear and fusion innovation! ๐ŸŒโœจ

NOTICE TO CANDIDATES ON RECRUITMENT FRAUD - We are committed to safeguarding candidates from fraudulent activity associated with our recruitment process. Please note that we will never offer specialist CV writing services, request payment or ask for sensitive personal information during the recruitment process.

We are committed to equal treatment of candidates and promote, as well as foster all forms of diversity within our company. We believe that bringing together people with different backgrounds and perspectives is essential for creating innovative and impactful solutions. Skills, talent, and our peopleโ€™s ability to dare are the only things that matter !. Bring your unique contributions and help us shape the future.

Trusted by 25,000+ job seekers

โ€œIt took my CV and asked me questions relevant to understanding what kind of jobs to suggest for me. Suggestions were almost perfect. Jobs were exactly what Iโ€™ve been looking for.โ€

Jessica, London

Get help applying for this job

Skills

Mechanical Engineering
Nuclear Engineering
Thermal Power Systems
Optioneering
Leadership
Communication
Requirements Management
Systems Engineering
Safety Legislation
Mentoring
Project Management
Design Reviews
HAZID Studies
HAZOP Studies
Quality Management
Organizational Skills

Location

Bolton, England, United Kingdom

Sign up to applySee more jobs like this