Salary: £60,000 - 60,000 per year Requirements: Previous experience in a Security Management role Knowledge and experience of National Protective Security Authority, Ministry of Defence and Defence and Equipment Support Principal Security Advisor compliance and accreditation standards for Industry Good presentation and communication skills, with the ability to influence colleagues and stakeholders at all levels 10 years residency in the UK Sole British national required for the role Responsibilities: Co-ordinate and deliver security activities within assigned projects Ensure contractual, regulatory and governance security obligations are interpreted, implemented and assured across the project lifecycle Provide subject matter expertise as a Security Advisor on policy requirements, industry best practice, and project security risks Develop standard and bespoke security policies, procedures and work instructions in collaboration with relevant stakeholders Chair security working groups and maintain records of actions and decisions Deliver tailored security education and training initiatives appropriate to audience and requirements Manage security incidents and conduct investigations, ensuring timely response for reporting obligations Flow down security requirements throughout the supply chain and manage supplier onboarding Support business continuity planning within assigned projects Respond to Customer requests for Security assurance Participate in internal and external security compliance audits Develop and maintain relationships with key security personnel within customer, partner, and supplier organisations Technologies: Flow Support Security AI Machine Learning More: At Leidos, we are seeking an enthusiastic protective security specialist to lead the implementation and assurance of security across complex Defence and UK Government projects in Farnborough, Hampshire. This role presents an exciting opportunity to work with experienced security professionals, influencing and shaping effective security outputs within a dynamic project portfolio. We are passionate about customer success and committed to fostering a collaborative culture with meaningful careers, healthy work-life balance, and career development. We offer a comprehensive benefits package that includes a contributory pension scheme, private medical insurance, 33 days of annual leave, and flexible working arrangements. We value diversity and encourage applications from all backgrounds. last updated 14 week of 2026