Senior Internal Auditor

Location: London based – 3 days per week required in office
Contract Type: Full time/Permanent

Salary – circa £80,000 per annum, dependent on experience

Bonus – 5%

Contributory pension – up to 7.5% (employee) 15% (employer)

28 days holiday + bank holidays, rising to 30 days after 5 years continuous service

Closing date : Wednesday, 7th January 2026.

About Us
Sizewell C is one of the UK’s largest and most significant infrastructure projects. Backed by a consortium of government, energy and institutional investors, we are progressing through the development phase as we prepare to build, commission, operate and ultimately decommission a new nuclear power station on the Suffolk coast.

The Opportunity
We’re looking for a Senior Internal Auditor to help deliver high-quality, independent assurance across financial, operational, compliance and project-related activities. Reporting to the Internal Audit Manager / Head of Internal Audit, you will deliver audit engagements in line with the IIA’s Global Standards and support the ongoing development of our audit approach as the project evolves.

What You’ll Be Doing

• Planning, delivering and reporting on internal audit engagements.
• Leading and overseeing outsourced audit teams through all stages of the engagement.
• Testing and documenting controls, processes and governance arrangements.
• Carrying out interviews with stakeholders to understand and assess business activities.
• Producing clear working papers that support audit findings and recommendations.
• Proposing practical improvements that strengthen risk management and internal control.
• Drafting concise audit reports and presenting these to process owners.
• Following up on agreed actions and monitoring progress.
• Building strong working relationships with stakeholders across the project.
• Supporting risk assessments and contributing to the design of audit methodology.
• Working closely with other assurance functions to align activity and avoid duplication.
• Ensuring compliance with audit standards and contributing to continuous improvement.
• Acting as a point of guidance for junior members of the team (either inhouse or co-sourced audit team).

About You
You’ll bring significant experience in internal or external audit, ideally gained in a large, complex or regulated environment or Internal Control advisory team from well-known accounting firm. You’ll be confident working to professional internal audit standards and able to operate independently while building strong, constructive relationships.

You’ll also have:

• Strong working knowledge of corporate governance, risk and internal controls.
• Experience leading audit or advisory engagements.
• Clear analytical, problem-solving and report-writing skills.
• Strong communication skills and confidence influencing at different levels.
• Experience of working with the Three Lines of Defence model.
• Good IT capability, including MS Office; exposure to audit software is an advantage.
• The ability to balance multiple priorities in a fast-moving environment.
• Flexibility to travel if required.

Qualifications:

• Degree in Finance, Business, Economics or a related discipline.
• Professional audit or accounting qualification preferred (CIA, CA, CPA, ACCA, ACA or equivalent).

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.