Company Description The UK government has pledged to reach carbon neutrality by 2050 and, as such, is pushing ahead with significant investment in nuclear and renewable energies. Assystem, as a leading provider of project management, design engineering & construction supervision services within the nuclear industry, has aligned its own strategy to support this switch to low-carbon energy, whilst also recognising transport and infrastructure systems to be a major factor in influencing the outcome of government policy. By acquiring Logikal in 2023, Assystem reaffirmed their commitment to the UK’s energy transition by combining strengths with a long-established provider of expertise to the transport & infrastructure sectors. We deliver professional services within PMO project delivery, particularly in the areas of project planning, project controls, risk management and enhanced business intelligence. Based on these solid foundations, our team continues to build on its existing capability and has ambitious plans to develop its reach within both the transport & infrastructure sectors and through the additional opportunities offered via the Assystem network within the nuclear sector. Our objectives will ultimately be defined by our ability to attract and retain those talented individuals who share our vision and wish to join us in shaping the future. Job Description We are seeking an accomplished and proactive Senior Project Planner to take a leading role in the planning and delivery of a high-value, complex project. As a key member of the Project Controls team, the Senior Project Planner will be responsible for developing and maintaining fully integrated schedules across the project lifecycle, ensuring alignment with cost, resource, procurement, and risk data. This role will involve working closely with senior stakeholders and cross-functional teams, providing strategic planning input, driving schedule performance, and influencing project outcomes through high-quality analysis and foresight. Key Responsibilities Lead the development and maintenance of comprehensive project schedules using Primavera P6 (or equivalent tools), covering all phases from design to commissioning. Oversee schedule integration across disciplines and functions including engineering, procurement, construction, and commissioning. Conduct detailed critical path, delay, and what-if analyses to support decision-making and risk mitigation. Establish robust planning controls, including progress measurement systems, performance baselines, and change control mechanisms. Mentor and provide technical guidance to junior planners and project teams. Develop and present high-level reports and dashboards (e.g. earned value, S-curves, KPIs) for executive and client stakeholders. Coordinate planning inputs during bid and tender stages, providing time-related deliverables and programme strategy. Act as a key interface between planning, cost, risk, and project management functions to ensure fully integrated project control. Additional Information 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 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