Commercial Assistant

Be a Power for Good at Sizewell C

Location: Suffolk, London or Bristol
Contract Type: Office-based, with hybrid working flexibility
Working Pattern: Full time

Closing date : Tuesday 2nd September 2025

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.

AtSizewell C, we’re building a better future — one powered by clean, reliable nuclear energy. Our project will supply electricity to six million homes, cut nine million tonnes of CO₂ annually, create thousands of skilled jobs, and support thriving natural habitats.

We’re looking for Commercial Assistants to help us deliver one of the UK’s most ambitious infrastructure projects. If you’re ready to make a meaningful impact, this is your opportunity.

The Opportunity

As a Commercial Assistant, you’ll provide essential support to the Supply Chain Management Team. You’ll work closely with colleagues across Nuclear Development to ensure contracts are delivered effectively and contribute to the success of the Sizewell C project.

Key Responsibilities

• Contractor Applications: Process payment certificates in line with contractual terms.

• Progress Reviews: Attend valuation and progress meetings to monitor delivery.

• Reporting: Prepare commercial cost reports, progress metrics, and supplier performance reviews.

• Process Management: Manage the Early Warning process and maintain commercial tools such as CEMAR and SAP.

What You’ll Bring

• Experience in a commercial or procurement environment.

• Familiarity with industry-standard procurement practices.

• Understanding of contract performance, risk, and change management.

• Knowledge of estimating, valuations, cost reporting, and financial modelling.

Salary & Benefits

• Salary: £31,000 – £36,000 (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

Additional Benefits:

• Ongoing professional development

• Cycle-to-work scheme

• Employee discounts and pricing

Why Join Us?

At Sizewell C, you’ll be part of a team tackling one of the world’s biggest challenges — climate change. We’re committed to doing the right thing by our people, offering a supportive, inclusive environment where your voice is heard and your growth is supported.

Ready to power up your career?

Apply now or request the full job description to learn more.

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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.

Join the team at Sizewell C. The power of good for Britain.

It’s not every day you get the opportunity to shape the working culture of what will be one of Europe’s largest construction projects, while also helping Britain to reach its target of Net Zero emissions by 2050. That’s one of the reasons Sizewell C will be unlike anything you’ve ever experienced before, and you’ll need to be an exceptional professional to reach the high standards this critical infrastructure project demands.

The UK is experiencing a nuclear renaissance and Sizewell C – along with its sister project at Hinkley Point C in Somerset – is powering the change. We’re ramping up at pace as we look ahead to the Financial Investment Decision in early 2025, and the start of construction soon after. With government fully on board and public opinion shifting significantly in favour of nuclear, there’s never been a better time to join our project.

By submitting an application to this role, you acknowledge that you have read and understood Sizewell C’s employee privacy policy and EDF\’s employee privacy policy. Just to let you know, EDF will be processing and sharing information about your application on behalf of Sizewell C.

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