Commercial Assistant

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 Regulated Asset Base (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. We are now recruiting the below position:

Contract:

Permanent, full‑time

• Salary:
  Competitive, depending on experience
• Bonus: 5% annual incentive
• Pension:
  Up to 7.5% employee / 15% employer contribution

Kick‑start your commercial career on one of the UK’s most significant infrastructure projects.

You will be joining the SZC Site Delivery Commercial Team as a Commercial Assistant and play a vital role in supporting the delivery of the Site Delivery scope on a landmark nuclear project. This is a fantastic opportunity to gain real, hands‑on experience within a high‑performing commercial environment, working alongside experienced Commercial Managers and a collaborative, supportive team.

You’ll be at the heart of contract administration and governance, supporting day‑to‑day commercial activities while developing the skills and exposure needed to progress your career. If you’re detail‑oriented, proactive, and enjoy working in a fast‑paced, team‑focused setting, we’d love to hear from you.

• Supporting the Commercial Managers with contract administration, ensuring documentation is accurate, compliant, and well maintained
• Managing Applications for Payment, supporting timely processing and maintaining clear audit trails
• Preparing reports, trackers, and senior‑level updates
• Prioritising and managing multiple tasks to meet deadlines in a high‑volume environment
• Supporting supplier and stakeholder relationships
• Assisting with compliance reporting

• Strong communication skills with excellent attention to detail
• The confidence to build effective working relationships with stakeholders at all levels
• A proactive mindset with a genuine willingness to learn and develop
• Excellent organisational skills and the ability to juggle competing priorities
• Proficiency in Microsoft Office, particularly Excel, Word, and Power Point
• Previous experience of contract management systems (Unifier, CEMAR, SAP) desirable but not essential

• A major infrastructure project with national impact
• Supportive, collaborative team environment
• Hands‑on exposure to end‑to‑end contract management on a major UK nuclear infrastructure project
  The opportunity to work on a multi‑billion‑pound contract
  Clear progression pathways for individuals looking to build a long‑term career in commercial management

• Recognise the value brought from different cultures and experiences.
• Be open to other’s points of view and ideas, be willing to debate and to compromise.

• Positively challenge poor quality and performance.
• Identify solutions at the lowest possible level.
• Encourage others to bring new ideas forward.

• Value the rules and environment in which we operate.
• Give and receive…