Description

Leidos has a new and exciting opportunity for a Senior Information Systems Security Engineer (ISSE) in our National Security Sector's (NSS) 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 Leidos Pay and Benefits, including 4 or more weeks 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!

This position is eligible for a 15k sign on bonus!

Job Summary:

Are you ready to take on a mission-critical role supporting complex programs for the Warfighter? This is an exciting opportunity to contribute to national security efforts with lasting impact. As an ISSE, you’ll help shape secure systems and architectures that protect sensitive data across multiple environments.

Primary Responsibilities

• Participate as the primary security engineering representative on teams designing, developing, implementing, and integrating secure networking, computing, and enclave systems.
• Conduct technical security assessments to identify vulnerabilities, ensure compliance with IA regulations, and recommend mitigation strategies.
• Apply knowledge of IA policies and RMF processes to support security planning, risk analysis, and authorization activities.
• Support the enforcement of trusted relationships across external systems and architectures, ensuring consistent application of agency security policies.
• Develop and validate system security requirements, contributing to secure system design and implementation across multiple enclaves and classification levels.
• Review certification and accreditation (C&A) documentation for completeness and compliance, providing expert feedback to stakeholders.
• Recommend system-level security solutions and contribute to the development of enterprise-wide security architectures.

Basic Qualifications

• 14+ years of Information Security experience with a Bachelors Degree in Computer Science, Information Assurance, or related field OR 18+ years of directly related information security experience without a degree
• DoD 8570 compliance with IAM Level I or IAT Level II (i.e., CAP, or Security + CE)
• Clearance Requirement: Top Secret/SCI with Polygraph is required

Preferred Qualifications

• Experience with AWS environments and cloud security integration

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At Leidos, we don’t want someone who "fits the mold"-we want someone who melts it down and builds something better. This is a role for the restless, the over-caffeinated, the ones who ask, “what’s next?” before the dust settles on “what’s now.”

If you’re already scheming step 20 while everyone else is still debating step 2... good. You’ll fit right in.

Original Posting:
October 21, 2025

For U.S. Positions: While subject to change based on business needs, Leidos reasonably anticipates that this job requisition will remain open for at least 3 days with an anticipated close date of no earlier than 3 days after the original posting date as listed above.

Pay Range:
Pay Range $148,850.00 - $269,075.00

The Leidos pay range for this job level is a general guideline only and not a guarantee of compensation or salary. Additional factors considered in extending an offer include (but are not limited to) responsibilities of the job, education, experience, knowledge, skills, and abilities, as well as internal equity, alignment with market data, applicable bargaining agreement (if any), or other law.