Job Description

Commercial Assistant


Full-time
Shift Work?: No
Career area: Supply Chain, Facilities & Commercial Management
Primary Contractual Location: 25 Copthall Avenue
Term of Employment: Permanent

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Location:

London

Contract Type

: Office-based, with hybrid working flexibility

Working Pattern

: Full time

Closing date

: Thursday 29th January 2026

Why Join Us?

We're building the future. Sizewell C is a once-in-a-generation infrastructure project that will power Britain's energy security and net-zero ambitions for decades to come. Following our recent Final Investment Decision, construction is fully greenlit. This is your chance to be part of the largest investment in homegrown clean energy in decades, delivering low-carbon electricity to 6 million homes for at least 60 years.


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.

What's in It for You

Salary: Starting salary of 30,000 (depending on experience) Holiday: 28 days + bank holidays Pension: Up to 7.5% employee / 15% employer contribution Flexible benefits & hybrid working options

The Opportunity:

Join a friendly, diverse, and high-performing team directly involved in Europe's biggest construction project - delivering a reliable, low-carbon energy supply for decades to come. As Commercial Assistant, you'll provide essential support to the SZC Contracts and Procurement Team, working with senior stakeholders whilst maintaining the highest standards of integrity and confidentiality.

Key Responsibilities

Divisional / Departmental support. Provide high level administrative support to the Commercial team Duties include complex diary and email management, preparing briefs and presentations, coordinating cross departmental communications and ensuring smooth daily operations of divisional office. Assist the secretariat for monthly Commercial Approval Assist the secretariat for the bimonthly Commercial Approval Committee (CODEM). This includes collating and distributing papers, ensuring submissions have correct authorisations, recording minutes and actions, and following up on decisions. The role acts as the deputy secretariat function for CODEM. Assurance, Audit & Regulatory administration Provide support to the assurance, audit, and regulatory compliance activities. Responsibilities include preparing documentation for audits, maintain registers (e.g risk, actions, tracking deadlines for submissions and organising evidence for internal / external reviews. Team Coordination Maintain and Build relationships with key contacts and stakeholders Maintain confidentiality of all commercial and personal information Maintain data/records so that information is readily available and easily accessible Arrange meetings and co-ordinate the booking of rooms, arrange travel, accommodation, pool/hire vehicles and hospitality as required Creation of presentations and reports for the wider team Support to document management lead - management of the transfer of information to

The successful candidate will be confident in working with many different people, you will also interface with other teams across the SZC Project, such as Finance, supply chain and Site delivery.


The role is mostly desk based, with some hybrid working arrangements with the office based in London, so it requires lots of time in Teams calls and using on-line communications.

Skills & Attributes:

The ideal candidate will have:

Excellent communication skills and attention to detail. Ability to build positive relationships with stakeholders at all levels. A proactive approach and willingness to learn. Strong organisational skills and ability to manage competing priorities. Proficiency in Microsoft Office (Excel, Word, PowerPoint). Good understanding of Power BI and other reporting tools Able to organise their own time and others, working in an environment where priorities and requirements can change quickly. Able to work largely unsupervised, and confident in personal organisation. is comfortable talking to a wide range of people at lots of levels in a large organisation. Other Details: Location can be based in London or home working with routine trips to London and occasional visits to Site. Full-time 37 hours per week.

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

Key Competencies

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 tier 1s and 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 delivery 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 now and be part of something extraordinary.

Additional Information

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Join the team at Sizewell C. Our vision is to Lead The Way On Nuclear.


The Sizewell C team is one of the most exciting and largest new megaprojects in the UK, whilst being at the forefront of the UK's climate change agenda and energy policy. We have begun constructing a 3.2-gigawatt nuclear power station on the Suffolk coast in the East of England replicating, wherever possible, the design used for Hinkley Point C, another nuclear power station being built in Somerset.


When built, Sizewell C will be one of the largest power stations to operate in the UK. The power station will generate low carbon electricity for at least 60 years, supplying over 6 million homes and supporting around 7% of the UK's current electricity needs.


Our vision is to Lead The Way On Nuclear. We want Sizewell C to define what good leadership for the nuclear industry and British infrastructure looks like and deliver on it. We understand the feats of organisation, logistics, collaboration and imagination that building nuclear requires. We are building for the next generation for their home-grown energy, energy price stability and ultra-low carbon power in abundance. We also want to set the benchmark for maximising long-lasting social value as we build and demonstrate how smart collaboration can work for the benefit of communities - locally, regionally and nationally.


We are the first nuclear power station in the UK to be funded under the Regulated Asset Base funding model (RAB). Our largest shareholder is the UK Government, alongside equity partners La Caisse, Centrica, EDF and Amber Infrastructure.


Sizewell C operates within a complex and fast-moving stakeholder environment, engaging with a wide range of partners including government bodies, regulators, local communities, supply chain partners, and international collaborators. This makes Sizewell C a uniquely stimulating place to work -- where navigating evolving priorities, balancing interests, and building trusted relationships is just as critical as technical excellence. For those who thrive in dynamic, multi-dimensional settings, it offers unmatched professional challenge and growth.


When joining Sizewell C, 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.


At Sizewell C we encourage and embrace diversity and how it can improve our experience and performance at work. It is a requirement that those who join us have the right to work in the UK. Whilst sponsorship may be a possibility that we can explore, we are fully committed to local recruitment where possible, and those already holding the right to work in the UK.


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.


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.