Assystem is an international company with one mission: accelerate the energy transition around the world.Every day, our 7,500 switchers located in 12 countries (Europe, Middle East, Pacific Asia & Africa) connect their six thousand billion neurons to tackle the task of the century: switching to low-carbon energy.We are a collective committed to the actors who are making the energy switch. Sharing our knowledge, expertise and values allows us to innovate and think differently about the energy transition.Drawing on more than 55 years' experience in highly regulated sectors subject to strict security and safety requirements, we provide our customers with engineering and project management services, as well as digital services and solutions to optimize the performance of complex infrastructure projects throughout their life cycle. The Group is currently ranked third in the world for nuclear engineering.To ensure a viable, efficient, and reliable energy future for all.Job DescriptionJoin our Team:We are looking for a Senior Project Manager to fill a vital role in support of a key Defence Nuclear Sector Client (DIO), able to commit a minimum for 2 years to this challenging long term infrastructure project management roleYour Mission:Daily Portfolio Support: Assist the DIO with day-to-day operations to ensure smooth project delivery. Continuous Improvement: Review lessons learned to improve processes and outcomes. Process Compliance: Ensure all procedures align with DIO standards. ✅Programme Coordination: Support enabling programs like Digital, OCP, and Nuclear Baseline. Promote Collaboration: Lead a culture of openness and teamwork across the organization.