Security Architect

Location: Warrington or West Cumbria, with flexible working options available.

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.

We are seeking Architects of varying levels levels of experience, who are looking to develop a specialist career in Cyber. These roles sit within a maturing cyber security function in a highly regulated, safety and mission critical environment here at Sellafield. We are looking to recruit talented and passionate Architects who are looking to make a real impact in developing cyber capabilities in house.

The Security Architects will take responsibility for ensuring that cyber security is embedded by design into Digital, Enterprise, and Operational Technology systems. The roles will support the development and implementation of security architectures and standards across the organisation, delivering expert technical input and advising projects and programmes to reduce cyber security risk. Working across the three areas (Enterprise, Security, and OT), these roles will provide critical input to protect sensitive systems, data, and infrastructure in a nuclear regulated environment.

We are looking for a variety of skills to support us with our Mission, so whether you are a seasoned Security Architect or have a background in Solutions or Network Architecture with some understanding of cyber security and experience of working in regulated environments, we'd love to hear from you!

We invest heavily in our people and offer a variety of training / career pathways to truly develop our staff supporting them to become true experts in their field, and we are working on the biggest decommissioning site in Europe, meaning that the scope and variety of work is truly incredible.

• Support the development and implementation of security architectures and patterns aligned to enterprise strategy, regulatory expectations and control standards.
• Provide technical guidance and assurance on cyber security design during project and solution delivery.
• Translate business and technical requirements into secure architectural designs.
• Collaborate with Enterprise, Solution and OT Architects to ensure security is integrated into all designs.
• Assist in defining and maintaining security standards, guidelines, and reference architectures.
• Participate in technical design authorities and review boards, representing cyber security concerns.
• Keep abreast of emerging cyber threats and technologies to provide forward looking security architecture advice.
• Provide clear and actionable cyber security advice to a range of technical and non technical stakeholders.
• Support risk assessments, threat modelling and security control selection.
• Champion a 'Secure by Design' approach across ISO/ICT.

• Degree or equivalent experience in cyber security, information systems, or a related technical field.
• Knowledge of enterprise IT systems, networks, cloud platforms (e.g. Azure), and associated security practices, with a familiarity with secure design principles and architecture frameworks.
• Proven track record in security architecture or secure systems engineering within complex IT or OT environments with the ability to create and articulate technical security designs for diverse stakeholders.
• Understanding of cyber risk principles and security controls relevant to the chosen pillar.
• Strong understanding of threat modelling, secure architectures, and assurance processes.
• Experienced in delivering secure by design within a regulated environment (ideally nuclear, critical national infrastructure, or defence).
• Strong working knowledge of architecture frameworks (e.g. TOGAF, SABSA, or equivalent).
• Strong written and verbal communication skills, with the ability to explain complex topics clearly.
• Experience of working with stakeholders at multiple levels to influence design decisions.
• Awareness of regulatory and industry frameworks (e.g. CAF, NIST, CIS and NIS Regulations).

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.

• You will benefit from an annual bonus of up to 10% - 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
• 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:

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