Job Description As a Key Account Manager within our Nuclear Business Unit, you will play a strategic role in developing and managing customer accounts within the Fusion and Modular Nuclear sector. You will focus on building trusted relationships with leading stakeholders, helping position Assystem as a key delivery partner for these transformative technologies. Reporting to our Business Unit Director New Build, you will be responsible for leading key account plans and supporting growth strategy in collaboration with the wider Business Unit team. In this role, you will: Manage relationships with existing and new strategic clients Ensure sales order targets are achieved Update and champion CRM records to reflect current opportunities Provide accurate forecasting and bid tracking Maintain and deliver key account development plans Drive the capture of strategic, high-value opportunities Support internal strategic planning across the BU Identify and develop new customer opportunities Represent Assystem at senior client engagements and industry events