Security Architect

Sizewell C Company; Royal Borough of Greenwich; Hybrid; GBP 72,000 - 88,000; Full time

Benefits offered by this job

Salary: Competitive (depending on exp)

Bonus: 5% annual target

Holiday: 28 days + bank holidays

Pension: Market-leading (up to 7.5% -

Benefits: Health cover, cycle-to-work,

Hybrid working & development

Job summary

Sizewell C is recruiting an experienced Security Architect to lead the design and governance of secure technology solutions across the organisation. Working in a regulated, safety-critical environment, you will embed security from inception through delivery across systems, infrastructure, cloud platforms and OT.

You will collaborate with Cyber Security, Enterprise Architecture and Engineering to define security standards, assess risk and support resilient, compliant solutions.

Qualifications

• Proven experience in a Security Architect or senior cyber security role within large, complex organisations.
• Knowledge of security frameworks, cloud security, IAM, and Zero Trust.
• Experience designing secure enterprise and operational technology environments.
• Familiarity with security standards such as ISO27001, NIST, CIS, IEC 62443.
• Strong stakeholder management and communication skills.
• Ability to balance security, operational and business requirements.

Responsibilities

• Lead the design and governance of secure technology solutions across the Sizewell C organisation.
• Collaborate with Cyber Security, Enterprise Architecture, Engineering and third-party suppliers to define security standards, assess risk and support resilient, compliant technology solutions.

Skills

Security Architect experience

Security architecture frameworks

Cloud security (Azure/AWS)

IAM & Zero Trust

Threat monitoring

OT security design

ISO27001

NIST

CIS

IEC 62443

Stakeholder management

Security-business balance

Job description

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 fromdifferent culturesand experiences
• Be open to other's points of view and ideas, be willing to debate and to compromise

Positivity

• Positively challengepoor qualityand performance
• Identifysolutions at the lowest possible level
• Encourage tier 1s and others to bringnew ideasforward

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