Senior Information Systems Security Officer (III)

Leidos has a new and exciting opportunity for a Senior Information Systems Security Officer in our Intel Sector. 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 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 Enterprise Discovery lab with maintaining compliance and strengthening the security posture of critical mission systems via the Risk Management Framework. 

Qualified candidates are eligible for enhanced incentives including up to a $25K cash sign on bonus or a paid time off bonus.

Job Responsibilities/Qualifications:

• Ensure the appropriate operational security posture is maintained for an information system.
• 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.
• Bachelor's degree plus 8-years of relevant experience or master’s degree plus 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 (Security +, CAP, GSLC).

Security Clearance requirement:

• Candidates must possess an active TS/SCI with Polygraph to be considered for this role.

Desirable Skills: 

• Experience as an ISSO/ISSE 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.
• Excellent written and oral communication skills. ​​

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

CONMD

If you're looking for comfort, keep scrolling. At Leidos, we outthink, outbuild, and outpace the status quo — because the mission demands it. We're not hiring followers. We're recruiting the ones who disrupt, provoke, and refuse to fail. Step 10 is ancient history. We're already at step 30 — and moving faster than anyone else dares.

Original Posting:

August 24, 2026

Pay Range:

Pay Range $107,900.00 - $195,050.00

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.