Senior Information Systems Security Officer (ISSO-3)

Leidos Holding$107K — $195K *
Information Technology
5 - 7 years of experience
Job Overview by Ladders

Qualifications

  • Bachelor's degree with 8 years or master's degree with 6 years of relevant experience.
  • Information Assurance Manager (IAM) Tier 1 certification (CAP, Security + CE, GSLC).
  • Active TS/SCI with Polygraph security clearance required.
  • Ability to communicate effectively in both written and oral forms.
  • Experience with NIST 800-53 and Risk Management Framework (RMF).

Responsibilities

  • Maintain security posture for critical information systems.
  • Conduct continuous network monitoring to identify and rectify security risks.
  • Perform regular audits to ensure compliance with security standards.
  • Assist in preparing information systems for reaccreditation.
  • Collaborate closely with the information systems security manager to uphold security compliance.

Benefits

  • Up to $25K cash sign-on bonus available.
  • Paid time off bonus eligibility.
  • Collaborative, fast-paced work environment.
Full Job Description

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 to learn more about how this program Delivers Mission Success!

Seeking a self-starting, motivated individual to be the Information System Security Officer supporting Computer Network Operations with maintaining compliance and strengthening the security posture of critical mission systems via the Risk Management Framework; will be responsible for 6 System Security Plans (SSPs).

*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:

  • 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 eight (8) years of relevant experience or masters degree plus six (6) years of relevant experience.  An associates 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.

Careers.leidos.com

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Original Posting:
June 17, 2026

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 $107,900.00 - $195,050.00

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.

About Leidos Holding

Leidos Holding Careers

Joining Leidos Holding presents an unparalleled opportunity to advance one's career with a leader in innovation and technology. The company offers a plethora of job opportunities aimed at fostering professional growth and development in a diverse and inclusive environment.

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Leidos Holding is actively seeking skilled professionals who are passionate about leveraging their expertise to drive innovation and leadership in their fields. With a variety of open positions, Leidos Holding provides a platform for individuals to challenge themselves in a dynamic work environment.

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At Leidos Holding, innovation is at the core of everything they do. Employees are encouraged to think creatively and push boundaries. The company supports this drive for innovation through comprehensive professional development and diversity training programs that are designed to enhance skills and foster leadership.

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Leidos Holding is committed to creating a workplace where diversity is not only recognized but celebrated. With a culture that values and promotes diversity, Leidos Holding ensures that all team members have the opportunity to contribute, learn, and grow.

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For those starting their career, Leidos Holding offers internship programs that provide a robust foundation in the industry. Internships are a great way to develop essential skills, gain valuable work experience, and build professional networks.

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