Construction Supervisor; NEC

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 mobilises 8,000 experts in 13 countries and intervenes across the entire project lifecycle, in engineering, project management and digital solutions.

We’re looking for an experienced Construction Supervisor to join our growing team, supporting the delivery of major infrastructure projects within the UK nuclear sector. Reporting to the Construction Manager, you’ll oversee site activities, ensuring contractors deliver work safely, efficiently, and to the highest quality standards.

Working as part of the client team, you’ll primarily fulfil the NEC4 Supervisor role while supporting wider HSQE activities on site. This is an excellent opportunity to work on nationally significant projects within a highly regulated environment.

• Act as the NEC4 Supervisor, ensuring works comply with contract requirements and project scope.
• Supervise construction activities, monitoring quality, safety, and progress on site.
• Carry out inspections, witness testing, identify defects, and support quality assurance.
• Review contractor documentation, including Inspection & Test Plans (ITPs), Quality Plans, and construction methods.
• Work closely with Project Managers, contractors, and stakeholders to support successful project delivery.
• Maintain accurate site records, reports, and project documentation.
• Monitor contractor health and safety performance and support HSQE activities.
• Contribute to commissioning, lessons learned, and continuous improvement across projects.

• Experience supervising construction works on large civil engineering or infrastructure projects.
• Good understanding of NEC4 contracts and the Supervisor role.
• Strong knowledge of construction quality, health and safety, and site inspections.
• Excellent communication and stakeholder management skills.
• Ability to work effectively within regulated environments and manage multiple priorities.
• Strong organisational skills with attention to detail.
• Solid understanding of CDM Regulations and Health & Safety legislation.
• Minimum 15 years’ experience delivering major civil engineering or infrastructure projects.
• Experience in heavy civil construction, including groundworks, utilities, temporary works, reinforced concrete, and structural steel.
• Experience working within highly regulated environments with robust safety and quality management systems.
• Excellent attention to detail, strong organisational skills, and a collaborative approach to problem‑solving.
• Able to work proactively and confidently in complex project environments.

• Experience with in the Nuclear, Defence, Oil & Gas, or other highly regulated industries.
• Knowledge of Factory Acceptance Testing (FAT), Site Acceptance Testing (SAT), and commissioning activities.
• Experience with regulated control of work systems (e.g. NSAG or similar).
• Relevant construction or engineering qualifications.
• NEC4 Supervisor Accreditation (or willingness to achieve within six months).
• Previous experience in the Nuclear sector.
• Experience delivering building, prefabrication, or MEICA (Mechanical, Electrical, Instrumentation & Control) works.
• HNC/HND (or higher) in Civil Engineering or a related discipline.
• SMSTS, CITB CSCS Black Card, IOSH Managing Safely, and First Aid certification.

• A 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 and 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.
• Enhanced sick pay.

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Umbrella contractor.

Requires sole UK national with SC clearance.

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.