Mechanical Engineer - Nuclear

ALTEN is a global engineering and technology consultancy operating across over 35 countries worldwide. We partner with industry leaders across sectors including Aeronautics, Aerospace, Defence, Naval, Automotive, Energy, Rail, IT and many more to deliver innovative engineering solutions that drive technological advancement & support sustainable transformation.

Our teams of passionate and agile engineers work on cutting-edge projects that shape the future of technology and sustainability. At ALTEN, we empower talented engineers to innovate, solve complex challenges, and deliver impactful solutions that build tomorrow’s world—today.

Join us and start building tomorrow’s world today!

As a Mechanical Design Engineer, you will take ownership of engineering activities from concept through to detailed design and manufacture. Working closely with project, commercial, and engineering teams, you will be responsible for producing robust engineering solutions while supporting project delivery, technical bids, and design substantiation activities. This role has quite a flexible remote location, but it requires lots of travel across the UK to different Nuclear sites and travel to France.

This role is ideally suited to an engineer with 5-9 years of experience in mechanical design, strong proficiency in SolidWorks, and the ability to communicate effectively in both French and English.

Key Responsibilities:

Engineering & Design

• Produce engineering designs and associated technical documentation.
• Develop concept designs, full 3D scheme designs, and detailed manufacturing drawings using SolidWorks.
• Produce engineering substantiation through hand calculations.
• Review and verify engineering designs to ensure technical compliance and quality.
• Conduct peer reviews of concept designs, CAD models, manufacturing drawings, and engineering calculations.
• Deliver engineering activities in line with project schedules and technical requirements.

Project Delivery

• Manage the day-to-day technical delivery of allocated projects.
• Work independently with minimal supervision while collaborating closely with senior engineering leadership.
• Coordinate engineering activities and support the task management of assigned engineers.
• Ensure technical deliverables are completed to the required quality, cost, and schedule targets.

Commercial & Tender Support

• Support the Commercial team with technical input for bids and proposals.
• Review and interpret customer technical specifications.
• Produce technical responses and develop accurate engineering estimates for tender submissions.

Continuous Improvement

• Support the development of engineering capability across the business.
• Contribute to internship, graduate, and apprenticeship programmes.
• Promote engineering best practices, innovation, and continuous improvement initiatives.
• Support organisational change within a fast-paced and highly regulated environment.

Health, Safety & Compliance

• Demonstrate a strong commitment to health, safety, and wellbeing.
• Ensure compliance with relevant UK and European standards.
• Uphold data protection requirements and confidentiality standards.
• Promote diversity, inclusion, and ethical business practices.

Required Skills:

• 5-9 years of professional experience in mechanical design engineering.
• Fluent in both French and English.
• Strong experience using SolidWorks for 3D design and detailed manufacturing drawings.
• Experience producing engineering calculations and design substantiation.
• Ability to interpret technical specifications and translate requirements into practical engineering solutions.
• Strong problem-solving, analytical, and communication skills.
• Experience managing engineering work packages or projects.

Required Qualifications:

• A Bachelor’s or Master’s degree in Engineering, or equivalent military experience.

Desirable Skills:

• Experience within nuclear, defence, aerospace, energy, or other highly regulated sectors.
• Familiarity with engineering standards, design verification, and technical governance processes.
• Experience supporting technical tenders and commercial proposals.
• Previous mentoring or leadership experience.
• Knowledge of French Nuclear regulatory boards and regulations.

Why join us? 

We bring together entrepreneurial, tech-driven people to deliver innovative solutions for leading companies.

At ALTEN, you’ll work on exciting projects, supported by ongoing learning, mentoring, and clear career development tailored to your goals.

Join a passionate team and help build tomorrow, today.

In short you get: 

• A personalised career path and a rewarding management style 
• A huge diversity of engineering projects and industries
• Private Medical Insurance
• Cycle & Tech Scheme 
• Employee assistance programme
• Life insurance & Pension Scheme
• Social atmosphere, regular gatherings & team buildings
• Flexible way of working (role dependent)

We are proud to support the Armed Forces Covenant & actively encourage applications from members of the Armed Forces community, including veterans, reservists, service leavers, and military spouses/partners. We recognise the value of military skills and experience and are committed to ensuring that no applicant is unfairly disadvantaged during our recruitment and selection processes. 

ALTEN is committed to fostering a diverse and inclusive workplace and values the strength that comes from a global mix of backgrounds and perspectives. We welcome applications from all suitably qualified candidates, regardless of background or protected characteristics under the Equality Act 2010. If you require any reasonable adjustments during the recruitment process, please let us know. 

This role may require you to have or be willing to go through Security Clearance. As part of the onboarding process candidates will be asked to complete a Baseline Personnel Security Standard; details of the evidence required to apply may be found on the government website Gov.UK. If you are unable to meet this and any associated criteria, then your employment may be delayed, or rejected . Details of this will be discussed with you at interview.