Principal Project Manager ( Construction Delivery) in Helensburgh

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.

Your Mission:

We are seeking an experienced and driven Enclave & Logistics Project Manager to support the delivery of a high-profile capital infrastructure programme within a live operational environment. Reporting to the Senior Project Manager, you will play a critical role in delivering complex construction and infrastructure projects from early contractor involvement through to completion. This is a fast-paced, high-impact role where strong leadership, stakeholder management, and commercial awareness are essential.

What You’ll Be Doing:

• Lead projects from Early Contractor Involvement (ECI) through design, planning, construction, and commissioning
• Deliver enabling infrastructure works including buildings, roads, utilities, and security systems
• Define and drive project objectives, ensuring alignment with programme goals and business case requirements
• Build and manage relationships with a wide range of stakeholders, including senior internal and external partners
• Lead and motivate project teams, fostering a high-performing, collaborative environment
• Manage NEC4 contracts, ensuring suppliers deliver on time, within budget, and to the required quality
• Identify, assess, and manage risks and issues to avoid delays or cost escalation
• Take ownership of project budgets, providing accurate financial reporting and forecasting
• Support assurance processes and gateway reviews, providing evidence of progress and delivery confidence
• Ensure compliance with all governance, processes, and infrastructure standards
• Oversee contract close-out, ensuring all deliverables and financial commitments are met
• Develop and maintain project schedules, milestones, and reporting frameworks
• Produce and manage cash flow forecasts, implementing effective cost and change control processes
• Evaluate change requests and make recommendations based on impact assessments
• Maintain accurate project documentation, plans, and configuration management records

What We’re Looking For

Essential Experience & Skills:

• Minimum 10 years’ experience in construction or consultancy delivery, including at least 5 years in a management role
• Proven experience managing construction logistics within complex projects
• Strong commercial awareness, with the ability to understand cost vs value and confidently challenge Compensation Events (CEs)
• Hands-on experience delivering projects under NEC4 contracts, including change control and stakeholder management
• Demonstrated ability to manage diverse stakeholders in demanding environments

Desirable Experience & Skills:

• Experience working in complex, live operational or regulated environments
• Background in collaborative, integrated project delivery environments
• Security experience, including working with security teams on physical, procedural, or cyber measures
• Experience planning and delivering major service diversion projects
• Adaptability and flexibility in fast-changing project environments
• Working knowledge of Primavera P6
• Familiarity with CEMAR or similar contract management systems

Qualifications & Training

Essential:

• Membership of a relevant professional body (e.g. project management, engineering, construction)
• NEC4 Project Manager Accreditation

Desirable:

• Nuclear awareness training (e.g. NIC or equivalent)

A dynamic career management policy to enable our employees to progress through our five business lines: operations, project, technical, sales and support functions. Provide opportunities to work on exciting, global projects. Access to an employee assistance programme with free mindfulness, health, 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.

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.

Security – The incumbent of this role must be a minimum of SC cleared and a sole UK national. Working arrangements – The incumbent of this role must be able to do hybrid working with the ability to attend the site 3 days per week.

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.