Assistant Commercial Manager

Sizewell C Limited; Greater London; Hybrid; GBP 50,000 - 65,000; Full time

Benefits offered by this job

5% annual bonus

Pension: Up to 15% employer contrib.

Holidays: 28 days + Bank holidays

Employee discounts

Job summary

Sizewell C Limited (Sizewell C) is seeking an Assistant Category Manager – Professional Services to support the Category Manager and deliver end-to-end procurement activities across Corporate Functions. You will help develop procurement strategies, manage stakeholder relationships, and ensure governance compliance while driving continuous improvement.

This is a unique opportunity to contribute to a nationally significant energy project, where hybrid working is available and travel to offices

Qualifications

• Experience 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.

Responsibilities

• 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.

Skills

Procurement

Stakeholder management

Contract negotiation

Job description

London, GB, EC2R 7BP Bristol, GB, BS32 4TP Leiston, GB, IP16 4EW Felixstowe, GB, IP10 0DD Manchester, GB, M1 4HN

Career Area: Supply Chain

Location:

Preferrably 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 & Benefits

• Bonus: 5% annual incentive
• Pension: Up to 7.5% employee contribution, 15% employer contribution
• Holidays: 28 days annual leave plus Bank holidays

Additional Benefits:

• 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.

Join Us at a Pivotal Moment in UK Energy History

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 aAssistant Category Manager – Professional Services to support the Category Managerand help shape that journey.

About the Role

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.
• 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

• 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.

Why Join SZC?

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.

Power in Diversity

Sizewell C is a great place to work, where everyone is welcome.

To fulfil our commitment of doing the power of good for Britain, our ambition is to have a workforce which reflects and benefits the society we are part of and serve. Every worker on SZC, wherever they are, should help to create and experience the right environment where everyone on the team understands, respects and embraces diversity with a culture where everyone is treated with equal respect and are all given equal access to opportunities. By valuing the different points of view and experiences that having a diverse team brings, and by fostering an inclusive climate, we will create a great place to work and a more successful project.

We create the right environment where people feel able to bring their whole selves to work. Whilst working together there is mutual trust and appreciation created through the building of meaningful relationships with one another, aligned with our key values:

Respect: Value the rules and environment in which we operate

Positivity: Positively challenge poor quality and performance

Humility: Be open to other’s points of view and ideas, be willing to debate and to compromise

Solidarity: One team, working closely together and helping each other

Clarity: Communicate clearly and consistently

Sizewell C Limited (Sizewell C) is nuclear site licensed company whose business is to design, finance, construct, commission, operate, maintain, and eventually decommission the nuclear power plant and related infrastructure at Sizewell C in Suffolk. Sizewell C was formerly under the majority ownership of the EDF Group but is currently majority owned by HM Government and operates as an independent company. EDF remains a key shareholder in Sizewell C and the business therefore maintains close links to EDF as a part of its ‘nuclear family’.

As a Sizewell C employee, you may wonder why you are contacted by colleagues with an EDF email, or see the EDF logo on portals that you access and/or documentation you receive; this is because we have partnered with EDF for the provision of a number of support services whilst we complete a successful transition out of the EDF group.