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ASSYSTEM

Engineering services for design, construction, commissioning

Principal Mechanical Engineer

Mechanical Maintenance and Reliability EngineeringConfirmed live in the last 24 hours
Full-timeHelensburgh, UKNo salary listed

About the Job

Requirements

  • Broad mechanical engineering experience, including knowledge of systems such as pumps, cranes, HVAC, pressure systems, or diesel generators.
  • Ability to develop practical, innovative, and cost-effective engineering solutions for plant and infrastructure modifications.
  • Good understanding of British and international engineering design standards.
  • Strong analytical skills and ability to make informed, evidence-based decisions using technical data.
  • Written and verbal communication skills to engage effectively with stakeholders.
  • Ability to organise work, manage priorities, and deliver to agreed timescales.
  • HNC or equivalent qualification/experience in a relevant engineering discipline.
  • Strong understanding of the design intent for mechanical infrastructure within the nuclear sector or a similar highly regulated industry.
  • Sole UK nationality and SC clearance are required.

Responsibilities

  • Produce and review infrastructure design packages and technical specifications.
  • Define reliability, performance, and operational requirements for infrastructure systems.
  • Assess maintenance and work control procedures to support safe and effective operations.
  • Evaluate infrastructure design, material condition, ageing mechanisms, and asset suitability to support continued facility operation.
  • Promote a strong safety, security, and compliance culture across all activities.
  • Act as an intelligent customer, ensuring safety-related contracts and technical deliverables meet contractual and regulatory requirements.

Desired Qualifications

  • Experience in the nuclear sector or another highly regulated or high-hazard industry.
  • Incorporated Engineer (IEng) status, or equivalent experience.
  • A degree or equivalent qualification/experience in Mechanical Engineering or a related discipline.

About the Company

ASSYSTEM

Engineering services for design, construction, commissioning

Assystem provides engineering services for complex projects, covering design, construction, supervision, commissioning, and operation, with a strong focus on the nuclear and energy sectors. Its approach combines multidisciplinary engineering teams and project-management capabilities to move projects from initial concept through to operation. The company differentiates itself through a long track record, strategic acquisitions (including Alphatem in 1995 and Mactech Energy Group in 2025) and an early public offering in 2013, which have expanded its capabilities and market reach in the energy and nuclear fields. Its goal is to be a leading, reliable partner for clients by delivering end-to-end engineering services and helping them meet safety, performance, and regulatory requirements across the project lifecycle.

Company size
5,001-10,000
Company stage
IPO
Headquarters
Paris, France
Founded
1966

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