Principal Mechanical Engineer

Our Vacancy # Principal Mechanical Engineer – Defence – Glasgow – United Kingdom – 11/11/25 – Hybrid work – Share Assystem is an international company with one mission: accelerate the energy transition around the world. Every day, our 7,500 switchers located in 12 countries (Europe, Middle East, Pacific Asia & Africa) connect their six thousand billion neurons to tackle the task of the century: switching to low‑carbon energy.

We are a collective committed to the actors who are making the energy switch. Sharing our knowledge, expertise and values allows us to innovate and think differently about the energy transition. Drawing on more than 55 years’ experience in highly regulated sectors subject to strict security and safety requirements, we provide our customers with engineering and project management services, as well as digital services and solutions to optimise the performance of complex infrastructure projects throughout their life cycle.

The Group is currently ranked second in the world for nuclear engineering. To ensure a viable, efficient, and reliable energy future for all.

Your Mission:
We are seeking an Experienced Mechanical Engineer to support the technical capabilities of one of our major client’s Design Authority (DA) near Glasgow. This role is perfect for those with a background in Mechanical Design / Mechanical Engineering.

• Deliver technical excellence in specifying, producing, and assessing design packages for infrastructure.
• Define reliability and operational constraints for infrastructure systems.
• Assess work control procedures for infrastructure maintenance.
• Evaluate infrastructure design, material state, and ageing mechanisms to ensure continued safe operation of facilities.
• Promote a robust safety and security culture in all work practices.
• Act as an intelligent customer, ensuring safety‑related contracts meet all requirements.

• Minimum 5 years experience in the design assessment of mechanical plant and associated installations.
• Experience producing robust technical justifications to all own for relevant mechanical design modifications to be authorised.
• Ability to develop practical, creative, and cost‑effective solutions for design changes / modifications to plant infrastructure.
• Strong understanding of British and international design standards.
• Proven ability to make evidence‑based decisions using multiple data sources.
• Experience with HAZID / HAZOP studies.
• Strong time‑management skills with the ability to effectively manage and prioritise your workload.

• HNC or equivalent qualifications in a relevant engineering discipline.
• Detailed knowledge of the Design Intent for mechanical within the nuclear or a similar high‑hazard industry.

• Incorporated Engineer status or equivalent experience.
• Degree or equivalent qualifications in a relevant engineering discipline.

• Dynamic career management policy to enable employees to progress through five business lines: operations, project, technical, sales and support functions.
• Opportunities to work on exciting, global projects.
• Access to an employee assistance programme with free mindfulness, health, wellbeing resources and a confidential support line available 24/7 via phone or text.
• Discount vouchers for days out and restaurants, eye test and glasses vouchers, cycle‑to‑work scheme, free flu jabs.

• Sole UK national with SC or ability to gain Security Clearance.
• Staff or umbrella contractor.
• Ideally 3 days in the office.

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.

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