Commercial Assistant
Job Description
Location: London
Contract Type: Office-based, with hybrid working flexibility
Working Pattern: Full time
Closing date : Thursday 30th 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
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. By joining our Supply Chain Frameworks Team, as a Commercial Assistant you will play a key role in supporting the delivery of professional services contracts 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 contract management, 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 contracts and opportunities for progression, this is an excellent step for anyone looking to build a career in commercial management.
Key Responsibilities
Behavioural Competences
Humility
Apply now and be part of something extraordinary.
Additional Information
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.
Location: London
Contract Type: Office-based, with hybrid working flexibility
Working Pattern: Full time
Closing date : Thursday 30th 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 £40,000 (depending on experience)
- Holiday: 28 days + bank holidays
- Pension: Up to 7.5% employee / 15% employer contribution
- Flexible benefits & hybrid working options
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. By joining our Supply Chain Frameworks Team, as a Commercial Assistant you will play a key role in supporting the delivery of professional services contracts 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 contract management, 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 contracts and opportunities for progression, this is an excellent step for anyone looking to build a career in commercial management.
Key Responsibilities
- Support the Commercial Manager and team in managing professional services contracts from initiation to completion, including NEC/FIDIC/Bespoke framework agreements.
- Assist with contract administration, including drafting, reviewing, and maintaining accurate documentation.
- Manage Applications for Payment, ensuring timely processing and accurate records.
- Prepare reports, trackers, and updates for senior management, including board-level documentation.
- Prioritise tasks effectively to meet deadlines in a high-volume environment.
- Support supplier relationship management across multiple framework contractors.
- Assist with contract value tracking and budget monitoring.
- 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).
- Degree in a relevant subject or working towards a commercial qualification (desirable).
- Experience in a commercial, contract administration, or project support role (desirable).
- Understanding of contract management principles (desirable).
- Exposure to end-to-end contract management and commercial processes on a major nuclear infrastructure project.
- Opportunity to work with multiple stakeholders across professional services frameworks worth hundreds of millions.
- A supportive team environment focused on collaboration and development.
- Clear progression pathways for those seeking career advancement.
- 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
- Positively challenge poor quality and performance
- Identify solutions at the lowest possible level
- Encourage tier 1s and others to bring new ideas forward
- 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
- Communicate clearly and consistently
- Promote collaboration and team alignment
- Clearer and faster decision making
- Drive simplification at all levels
Apply now and be part of something extraordinary.
Additional Information
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.