Lead Security Engineer

Leidos has a new and exciting opportunity for a Lead Security Engineer in our Intel Sector's Cyber & Analytics Business Area (CABA). Our talented team is at the forefront in Security Engineering, Computer Network Operations (CNO), Mission Software, Analytical Methods and Modeling, Signals Intelligence (SIGINT), and Cryptographic Key Management. At Leidos, we offer competitive benefits, including Paid Time Off, 11 paid Holidays, 401K with a 6% company match and immediate vesting, Flexible Schedules, Discounted Stock Purchase Plans, Technical Upskilling, Education and Training Support, Parental Paid Leave, and much more. Join us and make a difference in National Security!

Job Summary

Leidos is seeking a Lead Security Engineer to join a high-impact, multi-agency program serving the United States Space Force (USSF) / Space Systems Command (SSC), the United States Air Force (USAF), and other critical mission stakeholders. The selected individual will play key role in enhancing, testing, and deploying a large-scale Satellite Communications (SATCOM) system to an existing infrastructure. The ideal candidate brings deep expertise in public key infrastructure (PKI) and key management, excels at complex problem solving, and has a strong record of delivering results as part of a high-performing team in a fast-paced Agile Development environment. This position offers a unique opportunity to enhance the resilience and cybersecurity of mission-critical communications that protect our nation.

Join a team where your "greatest work" isn't just a slogan—it’s our daily standard.

• This position is based near Columbia, Maryland, with possible alternative duty locations in San Diego, California, Englewood, Colorado, or Huntsville, Alabama. Relocation assistance may be available for qualified candidates.

The Lead Systems Engineer is responsible for the overall security architecture, ensuring all security requirements are defined, implemented, and verified. She/he oversees all security engineering activities for a complex network environment with geographically distributed systems. The selected individual will manage a team of Information Systems Security Officers (ISSOs) and Information Systems Security Engineers (ISSEs), providing technical leadership and direction to meet program security requirements. She/he will mentor the team in sound information systems security engineering practices, play a key role in system testing, and work closely with other engineers and technical experts to enhance operational, test, integration, and development environments. Responsibilities include obtaining and maintaining Authorizations to Operate (ATOs) for all System Security Plans (SSPs) and ensuring ongoing compliance with Secure the Enterprise/Secure the Network (STE/STN) requirements.

Primary Responsibilities:

• Serving as a security subject matter expert (SME), providing guidance and oversight for the end-to-end security architecture.

• Engaging with multiple system owners across multiple networks to interpret, negotiate, and refine system and security requirements.

• Defining and driving security strategy, including risk assessment and management, security control assessment, continuous monitoring, service design, and broader cybersecurity program support.

• Identifying and analyzing security issues across complex, highly integrated systems and environments, and develop clear, actionable remediation recommendations.

• Designing, developing, and executing static and dynamic application security testing, as well as penetration testing activities.

• Partnering with development teams to improve understanding of vulnerabilities, attack vectors, and effective remediation techniques.

• Leading and mentoring program security engineers in day-to-day security engineering activities.

• Collaborating with the program security team to ensure STE/STN and continuous monitoring requirements are met for Test, Integration, and Development environments.

• Clearly articulating program security requirements, risks, and compliance challenges to multiple customer points of contact.

• Coordinating with internal cross-functional teams to plan, prioritize, and execute remediation and other security-related activities.

Basic Qualifications:

• Bachelor of Science degree in Information Technology, Information Assurance, or related field, and at least 12 years of relevant experience. Additional experience may be substituted for a degree.

• At least 10 years of experience leading diverse Security Engineering teams incl