Security Architect

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.

Security Architect

Location: Based in London on a hybrid basis with travel to Suffolk as required.

Contract: Permanent, full-time.

Salary: Circa £80,000 dependant on experience, plus benefits

Closing Date: Friday 18th September 2026

Benefits include:

Salary: Competitive (depending on experience)

Bonus: 5% annual target

Holiday: 28 days + bank holidays

Pension: Market-leading (up to 7.5% employee / 15% employer)

Benefits: Health cover, cycle-to-work scheme, discounts & more

Hybrid working & ongoing professional development

About the Role

We are seeking an experienced Security Architect to lead the design and governance of secure technology solutions across the Sizewell C organisation. Working within a highly regulated and safety critical environment, you will ensure that security is embedded into systems, infrastructure, cloud platforms, applications, and operational technology from inception through delivery.

You will collaborate with Cyber Security, Enterprise Architecture, Engineering, Infrastructure, Digital, and third-party suppliers to define security standards, assess risk, and support the delivery of resilient and compliant technology solutions.

About You

Proven experience in a Security Architect or senior cyber security role within large, complex organisations

Extensive knowledge of security architecture frameworks, cloud security principles across Azure and/or AWS, network and infrastructure security, Identity and Access Management (IAM), Zero Trust and secure access models, and security monitoring and threat management technologies.

Experience designing secure enterprise and operational technology environments

Knowledge of cyber security standards and frameworks such as ISO27001, NIST, CIS, or IEC 62443

Strong stakeholder management and communication skills

Ability to balance security, operational, and business requirements

Why Join Us?

Be part of one of the most important low-carbon energy projects in the UK.

Work in a mission-driven environment that values innovation, integrity, and long-term sustainability.

Competitive salary, comprehensive benefits, and opportunities for career development.

Flexible and hybrid working options.

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 today.

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.