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ASSYSTEM

Engineering services for design, construction, commissioning

Senior/Principal Plant Layout Engineer

Mechanical EngineeringConfirmed live in the last 24 hours
Full-timeDerby, UKNo salary listedHybrid

About the Job

Requirements

  • A degree in Mechanical Engineering or a related discipline, or equivalent industrial experience.
  • Extensive experience in plant layout, piping layout, plant integration, and multidisciplinary engineering delivery.
  • Experience leading complex engineering studies and technical decision-making.
  • Strong understanding of systems engineering principles, requirements management, and interface management.
  • Strong understanding of constructability, maintainability, modularisation, and lifecycle considerations.
  • Experience leading multidisciplinary teams, workshops, and design reviews.
  • Experience supporting major design reviews, technical governance activities, and engineering assurance processes.
  • Experience using E3D, PDMS, Plant 3D, Siemens NX, Revit, Inventor, and Navisworks, or equivalent platforms.
  • Strong report-writing, presentation, and stakeholder-management skills.
  • Ability to influence senior stakeholders, clients, and project teams.
  • Ability to define engineering strategy while remaining engaged in technical delivery.
  • SC clearance or the ability to achieve it.

Responsibilities

  • Lead plant layout development from concept through detailed design for complex facilities and plant areas.
  • Act as technical lead for major buildings, systems, or programme-level integration activities.
  • Lead development of equipment, piping, cable tray, access, and maintenance arrangements.
  • Lead piping-routing studies and layout-optimisation activities.
  • Provide technical leadership across multiple projects and programmes.
  • Lead requirements-driven layout development and multidisciplinary integration activities.
  • Define layout-integration methodologies, standards, and engineering approaches.
  • Lead major optioneering, constructability, modularisation, and plant-integration studies.
  • Lead complex multidisciplinary reviews and technical workshops.
  • Provide technical assurance and review of layout deliverables.
  • Lead resolution of complex layout, routing, requirements, and integration challenges.
  • Ensure layout solutions satisfy operational, safety, constructability, and lifecycle requirements.
  • Support bids, proposals, and client-engagement activities.
  • Develop layout standards, procedures, and best-practice guidance.
  • Mentor engineers and support capability development.
  • Support recruitment, succession planning, and capability growth.
  • Author and review technical reports, engineering strategies, and client-facing documentation.

Desired Qualifications

  • Experience within the nuclear, fusion, small modular reactor, or advanced modular reactor sectors.
  • Experience supporting business development and client-facing activities.
  • Experience developing engineering standards, methodologies, and governance processes.
  • Candidates able to demonstrate experience through technical leadership, engineering decision-making, and delivery of complex engineering projects are encouraged to apply.

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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