Assistant Commercial Manager

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, while 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.

Location & Contract

• Location: London, Manchester, Suffolk
• Contract: Permanent, full-time

Benefits

• Bonus: 5% annual incentive
• Pension: Up to 7.5% employee / 15% employer contribution
• Hybrid Working: Typically, 2–3 days in the office per week, with flexibility based on business needs

Role

You will be joining our SZC Supply Chain Systems, Data, Governance and Performance team as an Assistant Commercial Manager and play a key role in supporting the implementation, support and maintain our systems landscape alongside the reporting on one of the UK's most exciting infrastructure projects. Working closely with a Commercial Manager and the wider team, you'll gain hands‑on experience in end‑to‑end procurement process, stakeholder engagement, and commercial governance. This fast‑paced role is perfect for someone who thrives on accuracy, prioritisation, and clear communication, while enjoying being part of a collaborative team that enables and supports both internal and external stakeholders. With exposure to multiple systems, stakeholders and opportunities for progression, this is an excellent step for anyone looking to build a career in commercial management.

Accountabilities

• Provide support to Commercial managers regarding systems implementations.
• Coordinate, support and direct internal and external specialist teams to maintain existing supply‑chain systems and to implement identified improvements.
• Manage and oversee system enhancement / access requests to ensure the continued effective operation of supply‑chain processes and process controls.
• Develop and deploy training materials to support awareness and adoption of Supply‑Chain processes.
• Lead and coordinate responses to supply‑chain performance queries raised by internal and external stakeholders.
• Interface with Project services, Projects controls Finance, HR and other project functions as required to support combined data management and reporting.
• Provide oversight to Supply‑Chain reporting and prepare monthly reporting prior review with Senior Commercial Manager.

Reporting

Reporting to Senior Commercial Manager – Systems, data and Performance. Close relationship with 2 Commercial Managers.

Knowledge & Skills

• Intellectually rigorous – with gravitas to influence senior leaders.
• Technically proficient.
• Engaging and persuasive – the post holder must be seen as an in‑house expert who is able to influence the way in which employees think and behave.
• Excellent written and verbal communication skills.

Qualifications & Experience

The post holder should ideally hold a graduate / post graduate qualification(s) related to Supply Chain or a similar professional discipline and have 3+ years’ experience in a system / performance / data management role. Demonstrated ability to develop and manage cross‑functional relationships. Demonstrated ability to understand and manage a complex portfolio of responsibilities. Demonstrated success in delivering process and system improvements in support of broader business objectives.

Why Join Us

• A major infrastructure project with national impact
• Hybrid working with flexibility built in
• Competitive salary, bonus and benefits
• Clear progression and development opportunities
• Supportive, collaborative team environment

Behavioural Competences

• Humility: 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.
• 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. One team, working closely together and helping each other. Empowered teams always looking forward. Shared responsibility for delivery the project outcomes.
• Clarity: Communicate clearly and consistently. Promote collaboration and team alignment. Drive simplification at all levels.

Legal Statements

To be appointed to this role, you will need to meet the criteria for Security Vetting, which will, ordinarily, require you to have been a resident of the UK for at least three of the past five years. We encourage and embrace diversity and the right to work in the UK. Whilst sponsorship may be a possibility we fully commit to local recruitment where possible, and those already holding the right to work in the UK.