Lead Security Engineer TS​/SCI Poly

Job Summary

Leidos is seeking a Lead Security Engineer to support a mission‑critical program, offering a challenging and rewarding opportunity for a hands‑on technical leader in the security domain. The selected individual will lead all security engineering efforts for a large, complex network environment with geographically distributed systems; and will manage a team of Information Systems Security Officers (ISSOs) and Information Systems Security Engineers (ISSEs), providing technical leadership and direction to meet program requirements.

The selected individual will mentor the team in sound information systems security engineering practices and will be heavily involved in system testing. The selected candidate will work closely with other engineers and technical experts to enhance operational, test, integration, and development environments.

• Responsible for the overall security architecture, ensuring all security requirements are defined, implemented, and verified.
• Serve as a security subject matter expert, providing guidance and oversight for the end‑to‑end security architecture.
• Engage with multiple system owners across multiple networks to interpret, negotiate, and refine system and security requirements.
• Define and drive security strategy, including risk assessment and management, security control assessment, continuous monitoring, service design, and broader cybersecurity program support.
• Identify and analyze security issues across complex, highly integrated systems and environments, and develop clear, actionable remediation recommendations.
• Design, develop, and execute static and dynamic application security testing, as well as penetration testing activities.
• Partner with development teams to improve understanding of vulnerabilities, attack vectors, and effective remediation techniques.
• Lead and mentor a team of program security engineers in day‑to‑day security engineering activities.
• Collaborate with the program security team to ensure STE/STN and continuous monitoring requirements are met for Test, Integration, and Development environments.
• Clearly articulate program security requirements, risks, and compliance challenges to multiple customer points of contact.
• Coordinate with internal cross‑functional teams to plan, prioritize, and execute remediation and other security‑related activities.

• Master’s degree in Information Technology, Information Assurance, or related field, and at least 15 years of relevant experience. Additional experience may be substituted for a degree.
• At least 10 years of experience leading large, diverse Security Engineering teams, leading ISSO and ISSE teams.
• Current active CISSP certification.
• Certified Scrum Master certification.
• At least 5 years of experience applying Agile methodologies in security engineering projects, including Scrum or SAFe frameworks.
• Extensive hands‑on experience with modern security tools; hardware and software security implementation; communication protocols; encryption technologies; and web services.
• Expert‑level understanding of security vulnerabilities and remediation techniques, including risk assessment, risk management, and security strategy/design.
• Extensive experience formulating, implementing, and assessing IT security policy.
• Solid understanding of ATOs, SSPs, and STE/STN requirements.
• Direct experience collaborating with software developers, software testers, and integration, deployment, and sustainment teams.
• Strong communication and interpersonal skills, with a proven ability to clearly convey program requirements and system compliance challenges to multiple customer stakeholders.
• Demonstrated ability to coordinate across multiple internal teams for planning and remediation activities.
• Solutions‑oriented team player with a high level of self‑initiative.

• Additional certification:
  Information System Security Engineering Professional (ISSEP).
• At least twelve years of experience with defense‑in‑depth principals/technology (including access control, authorization, identification and authentication, public key infrastructure, network and enterprise security architecture) and…