Assistant Commercial Manager - Fix Term Contract

Location: London, Suffolk; Contract: Permanent, full-time; Closing Date: Friday 15th May 2026.

Sizewell C’s business is to design, finance, construct, commission, operate, maintain, and eventually decommission the nuclear power plant and related infrastructure at Sizewell C in Suffolk. Overall, whilst the Company is in the construction phase, the Boards’ principal focus is on the development and construction of Sizewell C on time, on budget and to the highest quality and safety standards. The Company is maturing to meet all these requirements.

Sizewell C is economically regulated by OFGEM under the RAB model similar to other UK electricity distribution networks and Thames Tideway. Sizewell C construction strategy is to replicate the design of Hinkley Point C, using the majority of the same supply chain, but innovating in the way it is delivered to achieve savings in time and cost of around 20%. The CCO will need to be guided by and incorporate lessons learned from the Hinkley Point C commercial delivery to achieve Sizewell C’s ambition.

Following Financial Completion and Revenue Commencement, Sizewell C is fully funded and is owned by The Secretary of State for Energy Security and Net Zero representing HM Government, La Caisse, Centrica, EDF and Amber Infrastructure. Sizewell C is entering an exciting phase of growth as we mature into an independent organisation and continue building one of the UK’s largest and most important energy projects.

What’s in It for You:

• Salary: Circa £47,000 (depending on experience)
• Bonus: 5% annual incentive
• Pension: Up to 7.5% employee / 15% employer contribution
• Leave: 28 days holiday plus bank holidays
• Hybrid Working: Typically, 2–3 days in the office per week, with flexibility based on business needs

Your Impact:

As Assistant Category Manager – IT, 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.

Key Responsibilities:

• Support the Category Manager with the following:
• Lead and support procurement processes from strategy to contract award.
• Incorporating procurement best practice approaches in all activities undertaken, such as cost saving initiatives, continuous improvement, key performance metrics, SLAs, KPIs and MI.
• 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.

What We’re Looking For:

• Experience in supporting/leading IT Procurement categories.
• 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.

Behavioural Competences:

• Humility – Recognise the value brought from different cultures and experiences. Be open to others’ points of view and ideas, be willing to debate and to compromise.
• Positivity – Positively challenge poor quality and performance. Identify solutions at the lowest possible level. Encourage others to bring new ideas forward.
• Respect – Value the rules and environment in which we operate. Give and receive feedback with respect. Embrace and engage with new people and ideas.
• Solidarity – One team, working closely together and helping each other. Empowered teams always looking forward. Shared responsibility for delivering the project outcomes.
• Clarity – Communicate clearly and consistently. Promote collaboration and team alignment. Clearer and faster decision making. Drive simplification at all levels.

If this sounds like the next step in your career, we’d love to hear from you. Apply today.