Job Title: Defence Security ArchitectLocation: Bristol Hybrid Working Security Clearance: SC eligible (or willing to undergo clearance)Are you passionate about embedding security into every stage of product development? We are looking for a proactive and skilled Security Architect to join a forward-thinking organisation committed to secure and resilient system design. This is a fantastic opportunity to influence and shape security strategies across cutting-edge products and technologies.Role OverviewAs a Security Architect, you will play a key role in designing, implementing, and overseeing security solutions to protect systems and products from emerging threats. You will work closely with development teams to apply secure-by-design principles, ensuring security is embedded throughout the product lifecycle.Key ResponsibilitiesDefine and integrate security requirements into the product development lifecycle.Perform threat modelling, risk assessments, and implement appropriate mitigation strategies.Advise on solution architecture to minimise security risks and ensure compliance with security standards.Collaborate with product teams to ensure security best practices are adopted.Maintain up-to-date documentation, guidelines, and training materials.Support incident response activities related to security breaches.Communicate risk findings clearly to stakeholders including technical teams and senior management.Drive continuous improvement and knowledge sharing across teams.What We’re Looking ForTechnical Experience & KnowledgeExperience with risk management frameworks and methodologies such as ISO/IEC 27001/2, ISO27005/31000, NIST 800-30, NIST 800-53.Strong understanding of security standards and frameworks including OWASP, Secure by Design principles, and MOD-specific guidelines (e.g., JSP, Def Stan 05-138/139).Familiarity with HMG security principles and assurance frameworks is advantageous.Comfortable using threat modelling tools and implementing mitigation strategies.Experience with NIST standards. (this is an absolute must)Key CompetenciesStrong communicator with the ability to present complex information clearly and confidently.Proactive problem solver who approaches challenges with innovation and critical thinking.Highly organised with a methodical approach to planning and task management.Resilient under pressure, with a drive to deliver results and meet deadlines.A team player with a collaborative mindset and strong stakeholder engagement skills.Why Join Us?You’ll be part of a team where security is at the core of every decision. This role offers the opportunity to make a tangible impact across a diverse portfolio of products and systems, while working in a supportive and forward-thinking environment.Interested?We’d love to hear from you. Submit your CV and a short cover letter outlining your experience and motivation for applying.Please note: All applicants must be eligible for SC security clearance.