Principal Project Manager

Company Description

About Assystem

Join Assystem, a global leader in engineering and project management, driving the energy transition worldwide. With over 7,750 Switchers, we blend our extensive engineering heritage with cutting‑edge digital technologies to support vital infrastructure projects. Our mission is to accelerate the clean energy transition, and we’re seeking passionate professionals to be part of this journey.

Why Join the Community of Switchers?

As one of the top three nuclear engineering companies globally, Assystem offers unparalleled opportunities to work on some of the most significant nuclear projects in the world. Join our community and be part of a team that’s shaping the future of clean energy, while benefiting from a dynamic, collaborative work environment.

You will play a crucial role supporting the delivery of the Sizewell C (SZC), a landmark nuclear project shaping the future of clean energy. Be a key player in this multi‑billion‑pound venture – one of the largest and most exciting developments in the UK today.

As Senior Project Manager in a technical programme, you’ll be in the driver’s seat, managing a high‑performing multi‑disciplinary team and overseeing the end‑to‑end delivery of critical systems, structures, and components for a number of buildings and contracts within the technical area.

This is a hybrid role, with approximately 2‑3 days based in the London or Bristol office and the remainder of the week working from home, subject to your manager’s requirements.

From engineering to commissioning, you’ll ensure excellence at every stage by:

• Leading Project Managers and multidisciplinary teams to achieve flawless delivery
• Owning budgets, schedules, risk management, and quality assurance
• Coordinating with internal and external stakeholders to navigate complex interfaces seamlessly
• Utilising your technical expertise and leadership to ensure the highest standards in execution and compliance
• Ensuring that the LoD are consistent with the agreed schedule(s) and to ensure Contract Partner(s) is delivering design output in accordance with the agreed schedule and the LoD
• Co‑ordination of the Task Order preparation for Equipment scope, preparation of Change Requests related to Task Order changes
• Anticipate, manage and resolve issues within the contact or package; identify risks and facilitate the resolution of all issues raised; develop and update the programme budget
• Undertake contract administration activities (with support of a Commercial Manager) including variations, Early Warnings, Compensation Events and claims, technical queries and instructions
• Managing risks & opportunities, and facilitating the resolution of all issues raised, developing and updating the programme budget, and escalating any issues
• Managing design changes and configuration management
• Proficient application of estimating, scheduling, programming, risk, and Earned Value Management tools
• Ensuring effective engagement with internal and external stakeholders, including interactions between the Programme and other engineering sequences
• Applying the principles of Continuous Improvement, ensuring that lessons‑learnt and knowledge‑capture are practiced as business as usual

A degree or equivalent qualification in Engineering, Construction or a related field

Professional qualifications such as MIMechE and ICE etc.

Qualification in Project Management such as APM PPQ or other recognised qualification

Proven track record in delivering large‑scale, complex projects

Experience of working over the full lifecycle of a project, from initial design through to commissioning

Commercial expertise, including managing high‑value contracts, cost control, and resolving claims.

Experienced in Risk & Quality Management

Proven relevant experience in a Project Management environment in a similar role

Technical / practical comprehension of engineering, procurement and construction methods and techniques

Hands‑on expertise with Earned Value tools, CDM Regulations, and quality assurance

Ability to produce accurate, complete and fully logic‑linked construction plans

High level of analytical…