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Commercial Manager – Fusion and Modular Nuclear Business Unit
Assystem, a leading independent nuclear engineering firm with expertise across highly regulated sectors, is expanding its team to support nuclear new build and Small Modular Reactor (SMR) programmes. We offer a dynamic environment with global impact—shaping the clean energy future in Britain and worldwide.
About Assystem
Today, Assystem is among the top three independent nuclear engineering firms worldwide. With over 60 years of experience, we support public and industrial stakeholders in executing complex projects that demand high safety and security standards. Mobilising 8,000 experts across 13 countries, we deliver projects from engineering and project management to digital solutions, ensuring complete coverage of the project lifecycle.
Job Description: Commercial Manager
The Opportunity
🚀 Join the Fusion and Modular Nuclear Business Unit! We seek a seasoned Commercial Manager to play a pivotal role in delivering nuclear new build and SMR programmes. Your responsibility will span pre- and post-contract commercial activities—ensuring compliance with robust governance, managing commercial risks, and optimising value while aligning with UK nuclear regulatory expectations.
You’ll lead multidisciplinary teams, engaging with clients, regulators, Tier 1 contractors, and supply chain partners to provide commercially robust solutions, driving successful outcomes for critical infrastructure projects.
Your Mission
- Lead commercial delivery from early contractor involvement (ECI) through procurement, execution, to final account for nuclear new build and SMR projects.
- Manage contract administration, compensation events, change control processes, and claims under NEC forms of contract (or equivalent).
- Develop and execute claims avoidance/mitigation strategies to safeguard project value.
- Guide and refine procurement strategies to support programme schedules.
- Manage supplier interfaces across the nuclear supply chain, ensuring effective packaging, sourcing, and commercial structuring for optimised risk and delivery.
- Oversee congressional analysis, performance monitoring, and corrective action reporting.
- Negotiate and resolve commercial disputes with contractors and suppliers.
- Collaborate with engineering, project controls, legal, and procurement teams to achieve seamless integration and delivery.
- Contribute commercial insights during bid development, including aspects like pricing, risk allocation, and contract strategy.
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Why Join Assystem?
You’re not just a candidate—you’re a key player in shaping the future of energy. Benefit from:
- Pension scheme with 8% company contribution (4% employee contribution)
- 25 paid annual leave days (flexibility to buy/sell)
- Sponsored professional development fees
- Flexible working policies
- Employee referral scheme
Requirements
Your Profile
You must demonstrate a robust foundation in high-stakes nuclear or-regulated project environments:
- Proven experience in commercial management for nuclear new build, SMR, or similar complex infrastructure projects.
- Deep expertise in managing NEC contracts (NEC3, NEC4) in challenging environments.
- Track record in supply chain negotiations, contract administration, and risk management across high-value Tier 1 contracts.
- Strength in cost forecasting, commercial reporting, and financial optimisation.
- Familiarity with risk assessment, claims resolution, and change management for large-scale programmes.
- Preferably hold a degree (or equivalent) in Quantity Surveying, Commercial Management, or related discipline (highly desirable).
- Proficient in navigating regulatory or legislative oversight (where applicable).
- Experience across power generation, defence, or critical infrastructure projects.
- Ability to influence stakeholders, drive high-level commercial decisions, and manage complex negotiations.
- Highly analytical mindset with a drive for continuous value optimisation and risk mitigation.
- Strong leadership in cross-functional, high-priority environments while fostering collaborative and results-oriented culture.
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At Assystem, We’re Committed To
We celebrate diversity of thinking—believing that pioneering ideas stem from diverse backgrounds. Skills, talent, and boldness are what drive us forward. Welcome your unique perspective and contribute to defining the next era of innovation.
Recruitment Safety Notice
Assystem prohibits recruitment fraudences. Our recruitment process will never ask for sensitive personal information, request payments, or offer CV-writing services. Candidates must be aware of fraudulent activity—no legitimate job announcement will include payment requests.
Unlock your potential and be part of a group that helps shape the world’s energy future. We can’t wait to welcome you and harness your expertise.
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