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

• Ideally degree qualified (in engineering, science, business or a related field)

• Minimum 5 years’ experience in account management or business development

• Proven track record of success with strategic clients and complex accounts

• Strong experience in CRM systems and forecasting tools

• Excellent communication, stakeholder engagement and negotiation skills

• Strategic and analytical mindset

• Ability to work autonomously and collaboratively within a matrix organisation.

• Preferred:

• Experience in the nuclear, energy, infrastructure, or oil & gas sectors

• Familiarity with gated bid and review processes

• Understanding of fusion and modular reactor market landscape

• British nationality is preferred (due to security clearance requirements)

• Exposure to organisations such as Atkins, Cavendish Nuclear, Nuvia, Aegis, Tetra Tech, or Wood Group

Join Assystem to work on innovative energy projects, including SMR, AMR, fusion, and modular nuclear. Collaborate with top industry professionals and contribute to a sustainable future. Your future team is dedicated to excellence and pioneering solutions in the nuclear sector. Apply now to be part of our mission! 

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.