Lead Security Engineer

Product Security Engineer
About the Role
We are seeking an experienced Product Security Engineer with expertise in developing and maintaining bespoke security management solutions for Defence and Government customers.
Reporting to the Head of Engineering Projects, you will take ownership of all security aspects of product design, development, verification, and maintenance throughout the product lifecycle. You will be responsible for conducting security risk assessments, developing mitigation strategies, deriving security requirements, and working closely with engineering teams to design, implement, and maintain effective security controls.
This is an exciting opportunity to play a key role in delivering secure, high-assurance solutions while working alongside customers, security authorities, and multidisciplinary engineering teams.
Key Responsibilities
As Product Security Engineer, you will:
• Produce Security Management Plans, work package descriptions, and cost estimates to support bids, proposals, and service delivery activities.
• Conduct security risk assessments, mitigation planning, gap analyses, and prepare security assurance documentation.
• Define security requirements and provide guidance to development teams on implementing bespoke security controls.
• Work with internal and external security assurance authorities to demonstrate compliance with customer, regulatory, and industry security standards.
• Build relationships with organisations such as the NCSC and other relevant security bodies to support assurance and accreditation activities.
• Oversee and manage security activities across development, testing, and manufacturing environments.
• Advise teams on platform hardening, secure configurations, and penetration testing activities, including analysing results and defining remediation plans.
• Drive through-life security management activities, including vulnerability management, patch management, and obsolescence planning.
• Support and lead security incident response activities during security incidents or crisis situations.
• Review, contribute to, and maintain corporate product security policies and standards.
• Deliver product security training and awareness sessions to engineering and project teams.
What We’re Looking For
Essential Skills, Experience & Qualifications
• Proven experience developing bespoke product security solutions within defence, government, military, or highly regulated commercial environments.
• Degree in Engineering, Computer Science, Cyber Security, or a related discipline, and/or equivalent professional experience.
• Full membership of a recognised professional security organisation such as CIISec, ISC2, or ISACA.
• Strong knowledge of UK, EU, NATO, and international security standards and frameworks, including:
o UK MOD Secure by Design
o GovS 007
o HMG IS1 & IS2
o ISO 27001
o NIST SP 800-30, SP 800-37 and SP 800-53
o MOD Information Security JSPs
o EU Cyber Resilience Act (CRA)
o US DoD Information Security Policies
• Experience producing technical assurance documentation, including:
o Security Cases
o Security Operating Procedures
o Testing Security Instructions
o Key Management Plans
• Knowledge of cryptographic technologies and key management systems.
• Understanding of Model-Based Systems Engineering (MBSE) and the integration of security into engineering lifecycles.
• Experience applying security controls across operating systems, firmware, and software platforms.
• Excellent written and verbal communication skills.
• Strong stakeholder engagement and influencing skills.
• A proactive mindset with a passion for continuous improvement.
• Eligibility to obtain UK Security Clearance (SC), including UK Eyes Only requirements.
Desirable Skills & Experience
• Current DV clearance.
• Experience with Common Criteria security evaluation methodologies.
• Knowledge of quantum cryptography and quantum key management principles.
• Familiarity with threat intelligence sources and threat-informed security practices.
• Knowledge of NATO security policies, risk management, and accreditation processes.
• Understanding of government and NATO security advisory boards and governance structures.