Information System Security Specialist
About The Position
Key Responsibilities Support Information Assurance (IA) and cybersecurity processes across system lifecycles Implement and maintain RMF-based A&A activities, including legacy DIACAP where applicable Develop and maintain ATO packages, including artifacts and traceability documentation Evaluate and validate security controls and solutions for compliance with DoD requirements Utilize IA tools such as eMASS and ACAS to support authorization and continuous monitoring Ensure systems comply with security policies, STIGs, and configuration management processes Monitor and maintain the operational security posture of assigned systems Support change management and configuration control to ensure continued compliance Assist in developing and implementing system security policies and procedures Coordinate cybersecurity activities supporting mission and command objectives Required Qualifications Bachelor's and 2 years of relevant experience. Additional years of experience are accepted in lieu of degree. DoD 8570.01-M / 8140 compliant certification (e.g., Security+, CISSP, or equivalent) Minimum 3 years of experience in Cybersecurity, Engineering, Test & Evaluation (T&E), or A&A/C&A Working knowledge of RMF and/or experience with DIACAP Experience with IA tools such as eMASS and ACAS Familiarity with ATO documentation, security artifacts, and traceability requirements Ability to assess systems for compliance with classified processing requirements Must have active DoD Secret clearance or higher. Must be able to report daily to office in Quantico, VA. Preferred Qualifications IAT Level III certification Navy Qualified Validator (NQV) certification or ability to obtain Experience supporting Operational Technology (OT) or control systems A&A 5+ years of experience in A&A / RMF environments Experience in DoD or USMC cybersecurity operations Clearance Requirement Active TS/SCI clearance Work Location On-site: Marine Corps Base Quantico, VA 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: April 9, 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 $69,550.00 - $125,725.00 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.
Requirements
- Bachelor's and 2 years of relevant experience. Additional years of experience are accepted in lieu of degree.
- DoD 8570.01-M / 8140 compliant certification (e.g., Security+, CISSP, or equivalent)
- Minimum 3 years of experience in Cybersecurity, Engineering, Test & Evaluation (T&E), or A&A/C&A
- Working knowledge of RMF and/or experience with DIACAP
- Experience with IA tools such as eMASS and ACAS
- Familiarity with ATO documentation, security artifacts, and traceability requirements
- Ability to assess systems for compliance with classified processing requirements
- Must have active DoD Secret clearance or higher.
- Must be able to report daily to office in Quantico, VA.
Nice To Haves
- IAT Level III certification
- Navy Qualified Validator (NQV) certification or ability to obtain
- Experience supporting Operational Technology (OT) or control systems A&A
- 5+ years of experience in A&A / RMF environments
- Experience in DoD or USMC cybersecurity operations
- Active TS/SCI clearance
Responsibilities
- Support Information Assurance (IA) and cybersecurity processes across system lifecycles
- Implement and maintain RMF-based A&A activities, including legacy DIACAP where applicable
- Develop and maintain ATO packages, including artifacts and traceability documentation
- Evaluate and validate security controls and solutions for compliance with DoD requirements
- Utilize IA tools such as eMASS and ACAS to support authorization and continuous monitoring
- Ensure systems comply with security policies, STIGs, and configuration management processes
- Monitor and maintain the operational security posture of assigned systems
- Support change management and configuration control to ensure continued compliance
- Assist in developing and implementing system security policies and procedures
- Coordinate cybersecurity activities supporting mission and command objectives
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What This Job Offers
Job Type
Full-time
Career Level
Mid Level
Number of Employees
5,001-10,000 employees
