Senior Layout Integration Engineer
Confirmed on the employer's own hiring board on Oct 25, 2026. First seen by Alion on Jun 18, 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 Senior Layout Integration Engineer will lead development of integrated plant layouts across Fusion and Modular Nuclear programmes.
The successful candidate will act as a technical focal point for major plant areas or work packages, leading multidisciplinary coordination activities, resolving interfaces and driving design maturity through engineering studies, design reviews and technical decision-making.
The Senior Layout Integration Engineer will be accountable for delivery of assigned layout work packages, ensuring technical quality, integration and programme commitments are achieved.
Key Responsibilities
- Lead plant layout development from concept through detailed design.
- Lead development of equipment, piping, cable tray, access and maintenance arrangements.
- Lead piping routing studies and layout optimisation activities.
- Own delivery of assigned layout work packages and plant areas.
- Manage requirements, assumptions, constraints and interfaces across assigned scope.
- Coordinate interfaces between systems, buildings, structures and supporting infrastructure.
- Facilitate model reviews, layout reviews and multidisciplinary technical workshops.
- Lead clash detection and interface management activities.
- Support Human Factors, Fire, Architectural and Civil & Structural integration activities.
- Ensure layout solutions satisfy system, operational, safety, construction and maintenance requirements.
- Lead multidisciplinary activities to resolve requirements conflicts and integration challenges.
- Author technical reports, optioneering studies, design philosophies and engineering recommendations.
- Present and defend technical recommendations to stakeholders.
- Support modularisation, transportation, lifting and construction assessments.
- Mentor engineers and designers.
- Support development of layout standards, methodologies and best practice.
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.
- Significant experience in plant layout, piping layout, plant integration or multidisciplinary engineering delivery.
- Experience leading plant area development and multidisciplinary coordination activities.
- Experience facilitating design reviews, model reviews and technical workshops.
- Experience using E3D, PDMS, Plant 3D, Siemens NX, Revit, Inventor or similar CAD/BIM platforms.
- Experience using Navisworks or equivalent clash detection software.
- Strong understanding of equipment arrangement, piping layout, constructability and plant integration.
- Strong understanding of systems engineering principles, requirements management and interface management.
- Experience supporting gated design review processes and technical governance activities.
- Strong report writing, presentation and stakeholder engagement skills.
- Ability to author, defend and implement technical recommendations.
- SC Clearance or capable of achieving it.
Desirable Skills and Experience
- Experience within the nuclear, fusion, SMR or AMR sectors.
- Experience leading major work packages or plant areas.
- 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.