Assistant Commerical Manager; Sizewell C)

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Job Category:
Finance

Contract Partner Company:
Jobs Service

Employing Company:
Sizewell C

The Sizewell C Jobs Service supports local people into exciting, long-term careers across our Project.#SZCJobs

Assistant Commercial Manager
Sizewell C

Location:

Preferably London, with occasional travel to Ipswich. Successful candidate must be prepared to travel to the London office 2-3 days per week, if required, and on occasion to Suffolk and Bristol.
Contract Type:
Office-based, with hybrid working flexibility
Working Pattern:
Full time

• Salary: £42,000-£47,000 (depending on experience)
• Bonus: 5% annual incentive
• Pension:
  Up to 7.5% employee contribution, 15% employer contribution
• Holidays: 28 days annual leave plus Bank holidays
• Ongoing professional development
• Cycle-to-work scheme
• Employee discounts and pricing

We operate on an office-based contract model, but support hybrid working where possible. This means you’ll need to be based within reasonable travel distance of the office and able to attend in person when business needs require—typically 2–3 days per week, though this may vary by team or project. Flexibility to be on site when needed is essential.

Sizewell C (SZC) has recently secured Final Investment Decision (FID) approval, marking a major milestone in the UK’s energy future. As we transition into a standalone organisation, we’re laying the foundations for long-term success—and we’re looking for a Assistant Category Manager – Professional Services to support the Category Manager and help shape that journey.

You’ll play a key role in delivering end-to-end procurement activities (source to contract) across SZC’s Corporate Functions by supporting the Category Manager in meeting the category’s objectives. You’ll support the development and execution of procurement strategies, manage stakeholder relationships, and ensure compliance with governance frameworks—all while driving continuous improvement and best practice.

This is a unique opportunity to be part of a high-impact project from the ground up, helping to build a fair, transparent, and commercially robust procurement environment, whilst continuing your growth within Procurement.

Support the Category Manager with the following:

• Lead and support procurement processes from strategy to contract award.
• Manage commercial aspects of contracts during execution.
• Build trusted relationships with internal stakeholders to support pipeline development.
• Ensure compliance with SZC’s procurement policies and governance.
• Collaborate with legal teams on contract terms and NDAs.
• Develop RFP/RFQ packages and manage supplier engagement.
• Maintain accurate procurement records and reporting dashboards.
• Drive lessons learned and continuous improvement across procurement activities.

Experienced in procurement in the Professional Services, Legal, Insurance, Business Intelligence categories would be preferential.

• Strong stakeholder management and communication skills.
• Experience in corporate functions procurement and contract negotiation.
• Solid understanding of commercial law and contractual terms.
• Proven ability to manage high-value, multi-disciplinary contracts.
• Member or student member of CIPS (preferred).
• Experience working in cross-functional teams and advising senior management.

This is more than just a job—it’s a chance to be part of a nationally significant infrastructure project that will power millions of homes and help the UK meet its net-zero targets. You’ll be joining a passionate, collaborative team at a time of exciting growth and transformation.

For this…