Security Architect

Security Architect

Publication Date: Jul 24, 2026 Ref. No: 549893 Location: Remote Home, GB

About Atos Group: Atos Group is a global leader in digital transformation with c. 56,000 employees and annual revenue of c. €7.2 billion (at the go-forward perimeter), operating in 54 countries under two brands - Atos for services and Eviden for products and systems. European number one in cybersecurity and a leader in cloud, Atos Group is committed to a secure and decarbonized future and provides tailored AI-powered, end-to-end solutions for all industries. Atos Group is listed on Euronext Paris.

About Role: Contribution / Impact: This role offers the opportunity to contribute security outcomes of one of the UK's largest and most high-profile infrastructure programmes. The successful candidate will play a critical role in ensuring secure-by-design delivery across a programme of works with significant national importance.

Bigger Challenge / Scope / Responsibilities: This is an opportunity to step into a role with greater scope, responsibility, and impact. You will lead security across complex, multi-stakeholder programmes, addressing architectural and operational challenges that directly influence business and security outcomes.

Interesting Brand or Reputation: Join Atos and help secure some of the UK's most critical infrastructure. The scale, complexity, and visibility of these programmes will enhance your professional reputation, strengthen your personal brand, and position you as a trusted security leader.

Influence: This role provides a unique opportunity to shape and strengthen the cyber security posture of a Critical National Infrastructure organisation, influencing strategic decisions, driving behavioural change, and delivering security outcomes across the enterprise.

Hybrid: Initially, the role will require a presence at the client's Birmingham city centre offices for three days per week. As familiarity with the environment increases and key deliverables are achieved, the on-site requirement is expected to reduce accordingly.

Role Purpose

The Security Architect is responsible for ensuring that security is embedded into business and technology solutions by design. The role provides security leadership across projects, programmes and operational services, ensuring that security architectures, risks and controls align with business objectives, regulatory requirements and industry best practice. Working closely with technical architects, solution architects, project teams, operational teams and customer stakeholders, the Security Architect provides expert guidance and governance throughout the solution lifecycle.

Key Responsibilities

• Security Architecture & Design
• Develop and maintain security architectures, patterns, standards and reference designs.
• Review and assure solution designs to ensure compliance with security policies and security-by-design principles.
• Produce and review High-Level Designs (HLDs).
• Ensure solutions align with enterprise architecture, risk appetite and security strategy.

• Risk Assessment & Threat Modelling
• Conduct threat modelling exercises using recognised methodologies (e.g. STRIDE, MITRE ATT&CK).
• Perform security risk assessments for new and existing services.
• Identify vulnerabilities, threats and control gaps, recommending appropriate mitigation activities.
• Support risk management processes and risk-based decision making.

• Governance & Assurance
• Act as a security authority within architecture review boards and governance forums.
• Define and maintain security standards, controls and architecture principles.
• Review and approve architecture exceptions where appropriate.
• Ensure compliance with relevant regulations, contractual obligations and industry frameworks.

• Security Strategy & Roadmaps
• Support the development and maintenance of security strategy and roadmaps.
• Identify opportunities to improve security capability, resilience and operational effectiveness.
• Contribute to long-term security transformation initiatives.

• Stakeholder Engagement
• Collaborate with business leaders, delivery teams, operational teams, suppliers and customers.
• Translate complex technical security concepts into business-focused recommendations.
• Act as a trusted advisor on security architecture and cyber risk matters.

• Incident & Operational Support
• Provide architectural support during security incidents and major service disruptions.
• Support root cause analysis and remediation activities.
• Assist with security tooling evaluations and strategic technology decisions.

• Mentoring & Leadership
• Lead and mentor architects, engineers and technical specialists.
• Promote security awareness and best practice across teams.
• Contribute to the development of the organisation's security architecture capability.

Knowledge & Experience

Essential: Significant experience in Information Security, Cyber Security Architecture or Solution Architecture. Experience designing secure enterprise, cloud and hybrid environments. Understanding of: Identity & Access Management (IAM) Network Security Cloud Security (Azure and/or AWS and/or GCP) Security Monitoring and Incident Response Data Protection and Encryption Zero Trust principles Experience performing threat modelling and security risk assessments. Knowledge of security frameworks and standards such as: ISO 27001 NIST CSF CIS Controls NCSC Guidance Secure by Design principles Excellent stakeholder management and communication skills.

Desirable: Experience within regulated industries (Government, Critical National Infrastructure, Financial Services, Healthcare etc.). Knowledge of OT/ICS security environments. Experience supporting bids, proposals and customer engagements.

Qualifications & Certification

Desirable Certifications: CISSP CISM SABSA CCSP TOGAF AWS Certified Cloud Practitioner Microsoft Security, Compliance, and Identity Fundamentals (SC-900)

Key Competencies

Strategic thinking Technical leadership Risk-based decision making Problem solving Stakeholder management Communication and influencing Governance and assurance Continuous improvement mindset

Success Measures

Security requirements are embedded early in project lifecycles. Risks are identified and mitigated effectively. Architecture reviews are completed successfully and on time. Security compliance obligations are met. Stakeholders view the Security Architect as a trusted advisor.

We Care About Our Employees' Happiness By providing: Pension Scheme - contributions matched up to 10% Private medical Cover Income Protection Life Assurance 25 days paid leave + National Holidays Flex benefits program As a Disability Confident employer, we encourage applications from all applicants, especially, differently abled applicants. We aim to ensure that those who meet the minimum criteria for this position will be offered an interview. We are committed and willing to making reasonable adjustments to the application and assessment process to accommodate your needs. We are a care leaver friendly employer, if you require additional support with your application, please contact our recruiter or send an email to our dedicated mailbox - View email address on click.appcast.io. If you have any questions, please contact our recruitment partner Meyeppan M on LinkedIn Here at Atos, diversity and inclusion are embedded in our DNA. Read more about our commitment to a fair work environment for all. Atos is a recognized leader in its industry across Environment, Social and Governance (ESG) criteria. Find out more on our CSR commitment. Let's grow together.