Senior Information Systems Security Officer (ISSO-3)

Description

Leidos has a new and exciting opportunity for a Senior Information Systems Security Officer (ISSO) 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 , 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 :

Our LOE program provides our customer's Operations organization with the best possible solutions for their mission needs. We achieve this through rapid prototyping, new development, and advanced technology research. From leading-edge visualizations to analytic development, we're always pushing the boundaries to find new and better data sources and tradecraft to answer intelligence questions. With a focus on collaboration and a fast-paced environment, our prototype development program is the ideal place to grow your skills and make a real impact. Click here to learn more about how this program "Delivers Mission Success!"

Seeking a self-starting, motivated individual to be the Senior Information System Security Officer supporting the Joint Activities Integration Division with maintaining compliance and strengthening the security posture of critical mission systems and their System Security Plans (SSPs) via the Risk Management Framework.

Job Responsibilities / Qualifications :

• Mission Focus : Ensure the appropriate operational security posture is maintained for information systems. Support continuous monitoring of networks to detect and correct areas of security non-compliance, unmitigated vulnerabilities, and other risks. Follow consistent security processes and play a role in the information systems continuous monitoring program. Perform regular audits of information systems. Assist the information systems security manager in preparing the information system for periodic reaccreditation
• Technical Proficiency : Experience as an ISSO with emphasis on Defense-in-Depth principles, network, and enterprise security architecture. Experience applying the principles of the NIST 800-53 including the procedures in the Risk Management Framework (RMF). Familiarity with STE / STN requirements and associated tools and tradecraft.
• Qualifications : Bachelor's degree plus twelve (12) years of relevant experience or master's degree plus six (6) years of relevant experience. An associate's degree or 18 semesters hours of military coursework / training in a computer-related field plus 10-years of relevant experience or high school diploma / GED plus 12-years of relevant experience may be considered. Information Assurance Manager (IAM) Tier 1 certification (CAP, Security + CE, GSLC).
• Desirable Skills : Excellent written and oral communication skills
• Security Clearance : Active TS / SCI with Polygraph required to be considered for this role.

At Leidos, the opportunities are boundless. We challenge our staff with interesting assignments that allow them to thrive professionally and personally. For us, helping you grow your career is good business. We look forward to learning more about you - apply today!

Careers.leidos.com

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Come break things (in a good way). Then build them smarter.

We're the tech company everyone calls when things get weird. We don't wear capes (they're a safety hazard), but we do solve high-stakes problems with code, caffeine, and a healthy disregard for "how it's always been done."

Original Posting : October 2, 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 $126,100.00 - $227,950.00

The Leidos pay range for this job level is a general guideline onlyand 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.