Key Account Manager

Nuclear

Permanent / Support Functions

Derby

United Kingdom

23/06/26

On site

About Assystem

Today, Assystem is among the top three independent nuclear engineering firms worldwide. With over 60 years of experience in highly regulated sectors, the group supports public and industrial stakeholders in the execution of complex and strategic infrastructure projects, subject to high safety and security requirements.

Assystem mobilizes 8,000 experts in 13 countries and intervenes across the entire project lifecycle, in engineering, project management and digital solutions.

Job Description

Join the Fusion and Modular Nuclear Business Unit! As a Key Account Manager within our Nuclear New Build Business Unit, you will play a strategic role in developing and managing customer accounts within the Fusion and Modular Nuclear sector, covering a wide range of customer and technologies.

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 Key Account Director New Build, you will be responsible for leading key account plans and supporting growth strategy in collaboration with the wider Business Unit team and other business units.

Your role:

Manage relationships with existing and new strategic external 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

Developing and growing the business with the skills to identify and develop new customer opportunities

Represent Assystem at senior client engagements and industry events

Why Apply?

Join Assystem and become a key player in delivering critical nuclear projects that shape the future of energy. Embrace this opportunity to excel in a dynamic environment where your expertise and leadership will drive global innovation.

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

My profile

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

Previous 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 management/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)

NOTICE TO CANDIDATES ON RECRUITMENT FRAUD – We are committed to safeguarding candidates from fraudulent activity associated with our recruitment process. Please note that we will never offer specialist CV writing services, request payment or ask for sensitive personal information during the recruitment process.

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.