Role: SC Cleared Security Engineer Location: Hybrid - 3 to 4 days per week onsite in North-West London Day Rate: £500 per day (Outside IR35) We're recruiting multiple Security Engineers on behalf of a major defence client. You'll play a critical role across the full product lifecycle: developing and maintaining robust product security for government and military platforms. From risk assessment and accreditation support to incident response, documentation, and through-life security planning, you'll help embed secure engineering practices while supporting continuous improvement, training, and policy development. Key Requirements: Experience in product security engineering for defence/government programmes Strong background in risk assessments, mitigation planning & accreditation Familiar with: ISO27000, NIST SP800, JSP440, GovS 007, Common Criteria Understanding of platform security, firmware, cloud, and TEMPEST controls Degree in relevant field and/or NCSC-certified (e.g. CISSP, CISM) Strong documentation and stakeholder engagement skills If you're an SC-cleared Security Engineer looking for your next Outside IR35 contract in the defence space, we'd love to hear from you.