Job Description

Company Description

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

As a Nuclear Design Engineer, you’ll be responsible for designing components, assemblies, and systems that meet stringent requirements for safety, cost, availability, and longevity. From early concept through to in-service support, you’ll ensure every design is resilient, efficient, and built to perform under real-world conditions.

You’ll work across nuclear plant systems and supporting equipment—including tooling, assembly/disassembly systems, and maintenance solutions—contributing to every stage from design to deployment and beyond.

🧠 What You’ll Be Doing

Develop innovative, reliable design solutions aligned with system and sub-system requirements

Manage projects from concept through to verification, delivery, and in-service support

Collaborate with stakeholders across engineering, manufacturing, and service teams

Lead design verification through testing and analysis

Maintain safety justifications and resolve in-service issues

Interpret test data and validate designs against analytical models

Drive continuous improvement in tools, processes, and methods

Support supplier assessments and qualification activities

Ensure compliance with technical standards, safety requirements, and company values🎯 Key Responsibilities

Translate system requirements into detailed component-level designs

Deliver projects on time, within budget, and to quality standards

Identify and manage technical, cost, and schedule risks

Lead investigations, technical packages, and problem resolution

Provide expert guidance within your engineering discipline

Support production, integration, maintenance, and decommissioning activities

Define and execute verification, qualification, and safety strategies

Qualifications

🎓Key Experiences and Qualifications

Degree (Bachelor’s, Master’s, or PhD) in Engineering or equivalent experience

Proven experience in design engineering across the product lifecycle

Strong analytical, problem-solving, and innovative thinking skills

Experience with safety justification, product integrity, and verification methods

Background in R&D, testing, and analytical modelling

Membership (or working towards) of a relevant professional body

Additional Information

🚀 Why Join Assystem?

✨ Work on nationally significant, technically complex projects

📈 Strong career development and progression opportunities

🤝 25 days annual leave (buy and sell leave scheme)

🌍 Opportunity to make a real impact in energy, defence and infrastructure

**Security clearance**

This role requires the successful candidate to hold a minimum of a Security Check (SC) clearance without any caveats to that clearance.

Due to the nature of work this role will be delivering and for the protection of certain assets, the successful candidate has to be a UK national or in MoD approved cases a Dual National from a non-ITAR country.

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 people’s ability to dare are the only things that matter !. Bring your unique contributions and help us shape the future