Key Account Manager

ASSYSTEM; United Kingdom; Hybrid; GBP 60,000 - 80,000; Full time

Job summary

A leading nuclear engineering company in the UK is seeking a Key Account Manager to develop and manage customer accounts in the Fusion and Modular Nuclear sector. You will build trusted relationships with stakeholders, ensuring successful growth strategies and achieving sales targets. Ideal candidates have experience in account management within the energy sector and excellent communication skills. The role offers hybrid working and a competitive benefits package, including pension contributions and health plans.

Benefits

Hybrid Working – Flexibility to work from home and the office

25 Days Annual Leave + Bank Holidays

8% Company Pension Contributions

Income Protection & 3x Salary Death-in-Service Cover

Competitive Sick Pay

Healthcare Cash Plan

Free Digital Gym Access

Exclusive Discounts

24/7 Employee Support Line

Cycle to Work Scheme

Paid Professional Membership Fees

Volunteer Days

Qualifications

• Previous experience in account management or business development.
• Experience in the nuclear, energy, or infrastructure sectors.
• Proven track record with strategic clients and complex accounts.
• Ability to work autonomously and collaboratively within a matrix organisation.

Responsibilities

• Manage relationships with existing and new strategic clients.
• Ensure sales order targets are achieved.
• Update CRM records to reflect current opportunities.
• Provide accurate forecasting and bid tracking.
• Maintain key account development plans.
• Drive capture of strategic, high-value opportunities.

Skills

Account management experience

Business development

Communication skills

Stakeholder engagement

Negotiation skills

Analytical mindset

Education

Degree in engineering, science, business or related field

Tools

CRM systems

Forecasting tools

Job description

At Assystem, our mission is to accelerate the energy transition worldwide. With over 55 years of expertise in highly regulated sectors, our 7,500 Switchers globally deliver cutting‑edge engineering and project management solutions. Join us and be part of one of the top three nuclear engineering companies in the world!

🤝 Why Join the Community of Switchers?

As a member of Assystem, you'll be part of a team driving the low‑carbon energy future. We’re ranked second globally in nuclear engineering, offering you the chance to work on world‑class projects. Together, we’ll innovate and shape tomorrow’s energy solutions.

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.

Focus on building trusted relationships with leading stakeholders, helping position Assystem as a key delivery partner for these transformative technologies.

Reporting toour 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

Qualifications

Previousexperience in account management or business development

Experience in the nuclear, energy orinfrastructuresectors

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.

Degree qualified (preferably in engineering, science, business or a related field)

Preferred:

• Familiarity with gated bid and review processes
• Understanding of fusion and modular reactor market landscape
• Exposure to organisations such as Atkins, Cavendish Nuclear, Nuvia, Aegis, Tetra Tech, or Wood Group

Please note: Due to the nature of this role, the successful candidate will be required to obtain and maintain UK security clearance. Eligibility for such clearance is determined by the relevant UK government authorities and typically requires British nationality.

Additional Information

💡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!

Your Benefits Package

• 🏠 Hybrid Working – Flexibility to work from home and the office
• 🏖️ 25 Days Annual Leave + Bank Holidays
• 🔄 Buy & Sell Holiday – Make your time off work for you
• 💰 8% Company Pension Contributions
• 🛡️ Income Protection & 3x Salary Death-in-Service Cover
• 🤒 Competitive Sick Pay – Support when you need it
• 🏥 Healthcare Cash Plan – Claim back on dental, optical & more
• 💪 Free Digital Gym Access – Expert‑led fitness classes
• 🎁 Exclusive Discounts – Restaurants, days out & top brands
• 📞 24/7 Employee Support Line – Mental health, financial & legal help
• 🚴 Cycle to Work Scheme – Save money & go green
• 💉 Free Flu Jabs & Eye Test Vouchers
• 🧾 Paid Professional Membership Fees
• ❤️ Volunteer Days – Make a difference on company time

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.