Layout Integration Engineer
Confirmed on the employer's own hiring board on Oct 25, 2026. First seen by Alion on Jun 17, 2026. Assystem scores B on the Alion truth index.
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.
Join the Fusion and Modular Nuclear Business Unit! Reporting to the Layout Engineering Manager, the Layout Integration Engineer will be responsible for development and delivery of integrated plant layouts across Fusion and Modular Nuclear programmes, including Small Modular Reactors (SMRs), Advanced Modular Reactors (AMRs) and Fusion projects.
The role combines plant layout engineering, piping layout, multidisciplinary integration, systems engineering awareness and CAD/BIM capability. The successful candidate will work closely with Process, Mechanical, Electrical, Civil & Structural, Architecture, HVAC, Fire, Human Factors and Systems Engineering disciplines to develop safe, constructable, operable and maintainable plant arrangements.
The Layout Integration Engineer will take ownership of assigned systems, buildings or plant areas and drive layout development from concept through detailed design.
Key Responsibilities
- Own layout development for assigned systems, buildings or plant areas.
- Develop integrated equipment, piping, cable tray, access and maintenance layouts.
- Interpret and apply PFDs, P&IDs, equipment data sheets, line lists, requirements and engineering constraints.
- Capture and manage design assumptions, constraints and interfaces.
- Develop layouts within 3D CAD/BIM environments.
- Lead piping routing studies and plant integration activities within assigned scope areas.
- Act as the primary layout focal point for assigned work packages.
- Coordinate design activities across multiple engineering disciplines.
- Lead multidisciplinary workshops, model reviews and layout reviews.
- Identify clashes, interfaces and design conflicts and drive their resolution.
- Ensure layout solutions satisfy system, operational, safety, construction and maintenance requirements.
- Produce general arrangements, layout studies and engineering deliverables.
- Author technical reports, optioneering studies, design philosophies and engineering recommendations.
- Present technical solutions and recommendations to stakeholders.
- Support modularisation, construction and maintainability assessments.
- Support requirements management and interface management activities.
Why Apply?
Join Assystem and become a key player in delivering critical nuclear projects that shape the future of energy. Embrace this opportunity to excel in a dynamic environment where your expertise and leadership will drive global innovation.
Benefits include:
- Pension scheme (8% company contribution / 4% personal contribution)
- 25 days’ paid annual leave + bank holidays + option to buy or sell days
- Professional fees reimbursed
- Flexible working
- Employee referral scheme
Essential Skills, Qualifications and Experience
- Degree qualified in Mechanical Engineering or related discipline, or equivalent industrial experience.
- Experience in plant layout, piping design, plant design or multidisciplinary engineering projects.
- Experience within nuclear, power generation, defence, submarine, oil & gas, process plant or other complex engineering environments.
- Experience using E3D, PDMS, Plant 3D, Siemens NX, Revit, Inventor or similar CAD/BIM tools.
- Experience using Navisworks or equivalent model review software.
- Ability to interpret engineering documentation including PFDs and P&IDs.
- Understanding of systems engineering principles, requirements management and interface management.
- Strong communication and report writing skills.
- SC Clearance or capable of achieving it.
Desirable Skills and Experience
- Experience within the nuclear, fusion, SMR or AMR sectors.
- Experience leading plant areas, systems or work packages.
- Experience supporting modularisation and construction studies.
- Candidates able to demonstrate experience through technical leadership and delivery of complex engineering projects are encouraged to apply.
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.
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.