Exceptional people, creating extraordinary partnerships, developing game-changing technologies.

At Sellafield Ltd, we are harnessing our expertise; bringing together world-class skills and innovative technology to solve complex nuclear, infrastructure, and engineering challenges. By joining Sellafield Ltd, you join an amazing team of people, from all walks of life, where you can thrive in a connected, considerate culture of innovation, collaboration, and community; and play a significant part in the UK’s sustainable nuclear future.

The challenges we face are amongst the most complex anywhere in the world. We are using advanced technologies to shape, create and advance the world’s nuclear decommissioning knowledge and capability. That’s why our work is driven by people with a passion for problem-solving and innovation.

About the role

We are seeking a Security Architect Team Lead to take on a leading role in one of three specialist Security Architecture capabilities; Enterprise, Security, or Operational Technology. This role sits within a maturing cyber security function in a highly regulated, safety and mission critical environment and offers an exciting opportunity to make a real impact in developing our cyber capabilities in-house.
As the organisation embarks on a digital transformation journey, the role must balance strategic vision with practical delivery, working across traditional IT and emerging OT landscapes. Security by design must be embedded from ideation to operation, with architecture acting as the bridge between business objectives and technical implementation.
The Team Lead will be responsible for delivering expert design leadership, architectural oversight, and assurance to ensure digital systems and platforms across the business are secure by design, support business operations, and meet regulatory requirements. The role enables a consistent architectural approach through implementation of the ISO/ICT Security Architectural Framework and Team Leads must also coach and support the professional development of their team, while influencing cultural change across a complex stakeholder landscape.

Key responsibilities

• Provide day-to-day leadership to a defined team of the Security Architecture function (Enterprise, Security, or OT), acting as a subject matter expert and escalation point.
• Translate the organisational Security Architectural Framework into actionable designs and standards within the area and ensure consistent application across projects and programmes.
• Influence architecture and solution designs to ensure cyber security controls are embedded, scalable, and aligned with organisational policies.
• Lead architectural assurance across project delivery lifecycles, ensuring secure-by-design principles are implemented and evidenced.
• Engage proactively with delivery teams, internal customers, and governance forums to provide security architectural direction and insight.
• Contribute to the development of cyber security policies, standards, design patterns, and reusable artefacts in support of strategic goals.
• Develop the profession through mentoring, community of practice engagement, and contribution to capability frameworks.
• Support horizon scanning and risk-based prioritisation of technology solutions, identifying threats, vulnerabilities, and industry trends relevant to the nuclear and critical national infrastructure context.

Your skills and qualifications

• Degree or equivalent experience in Cyber Security, IT, Engineering, or related field.
• Demonstrated leadership in security architecture, including responsibility for designs affecting enterprise, cloud, or OT environments.
• Proven experience in applying security frameworks and delivering secure design outcomes in complex, regulated environments.
• Strong understanding of the threat landscape and risk-based security design.
• Effective communicator with the ability to influence both technical and senior non-technical stakeholders.
• Familiar with Microsoft and Azure security technologies (e.g. Defender, Sentinel, M365 Security stack).
• Capable of translating policy and strategic intent into design blueprints and delivery guidance.

Skills considered desirable

• Industry certifications such as CISSP, CISM, SABSA, TOGAF, or UK Cyber Security Council/CIISec accreditation.
• Experience with architecture frameworks (e.g. SABSA, TOGAF, Zachman).
• Familiarity with the UK Cyber Assessment Framework (CAF), especially Objective B.
• Experience of applying the Nuclear Industries Security Regulations (NISR) or similar safety-critical regulatory frameworks.
• Awareness of the Sellafield Ltd environment, operations, or similar critical infrastructure environments.

Why us?

At Sellafield Ltd, we are committed to supporting our employees in fulfilling their potential. With having 100 years of work in front of us, we offer comprehensive training and development opportunities, enabling you to feel inspired in your role. Whatever area you join us in, you’ll find a genuinely exciting and rewarding career.

Making sure our employees feel supported is important to us. Therefore, to help you get the most out of life in and outside of work, we also offer a range of employee benefits:
• You will benefit from an annual bonus of up to 15%, made up of company and personal performance
• An attractive defined contribution pension scheme – the company will match up to 13.5% for a 7% employee contribution!
• 30 days annual leave + bank holidays. Plus, the ability to purchase an extra 2.5 days per year.
• The ability to carry over 10 days annual leave each financial year
• Paid Sick Leave
• Family Friendly Policies – Visit our Rewards & Benefits page to read more
• Cycle to Work Scheme
• Lifestyle Benefits sasra.co.uk
• Learning & Development Opportunities https://careers.sellafieldsite.co.uk/work-with-us/learning-and-development/
• Reward & Recognition Policies.
• Welfare & Employee Assistance Programme
• Free Aviva Health App & Annual Health Check
• MyDiscounts – Employee Savings & Discounts
• MyBenefits – A Charity Giving Scheme
• Many, many more! Click this link to visit our Rewards & Benefits page: https://careers.sellafieldsite.co.uk/work-with-us/rewards-and-benefits/

Sellafield Ltd is a unique place to grow your career, offering a remarkable blend of role variety, job security, personal growth, professional development, and truly significant work. This is your opportunity to tackle some of the biggest challenges in the nuclear, infrastructural and engineering worlds and create a clean and safe environment for generations to come. Explore Sellafield Ltd today.

Sellafield Ltd are recognised as a Disability Confident Employer (Level 3). Disability Confident employers offer an interview to disabled applicants that meet the minimum criteria for a vacancy. Sellafield Ltd define the minimum criteria as the ‘essential skills’ which are listed on the vacancy notice. Whilst completing your application form, you will be able to indicate if you wish to be considered under the disability confident scheme. If you would prefer to discuss this directly with us, please contact the GBS Recruitment team on recruitment@sellafieldcloud.co.uk.