tooling). Provide expert advice on secure architectures, ensuring risks are understood, prioritised, and mitigated. Ensure compliance with MOD and HMG standards, including JSPs, Def Stan 05-138/05-139 , and ISN 23/09 Secure by Design . Support incident response, security investigations, and remediation activities … Defence, Aerospace, or National Security environments. Hands-on experience applying Secure by Design within product development , not only infrastructure. Practical, working knowledge of Def Stan 05-139 and its application within engineering lifecycles. Experience using threat-modelling tools and applying structured threat-modelling methodologies. Strong understanding of HMG Security ...