We are seeking an experienced Product Owner to lead the delivery and evolution of Product Security digital capabilities for a leading Defence client of ours. You will enable model-based cybersecurity and resilience across the enterprise, replacing document-centric practices with authoritative security models integrated across design, verification, and assurance. Key Responsibilities: Lead delivery and continuous improvement of Product Security toolchains and digital thread integrations.Define and deploy reference architectures, technical baselines, and best practices for model-centric security engineering.Translate business and engineering needs into roadmaps, prioritized backlogs, and end-to-end traceability from security objectives to assurance evidence.Engage stakeholders, manage vendors, and drive adoption of secure, model-based workflows.Ensure compliance with standards, regulatory frameworks, and audit requirements.Oversee operational performance, incident resolution, and continuous improvement of Product Security capabilities. Essential Skills and Qualifications: Degree in Systems Engineering, Cybersecurity, Engineering, Computer Science, or related field.10+ years delivering Product Security capabilities in regulated, safety-critical industries (Aerospace/Defence preferred).Expertise in model-based product security and digital thread integration.Experience with threat/risk modeling, security requirements, architecture and controls, SBOM/vulnerability management, ..... full job details .....