Leidos · 5 hours ago
Information System Security Office (ISSO)
Chantilly, VA
Full-time
Onsite
Mid, Senior Level
$131K/yr - $237K/yr
3+ years expLeidos is an industry and technology leader serving government and commercial customers, and they are seeking an Information System Security Officer (ISSO) to maintain the security posture of assigned information systems. The ISSO will ensure compliance with cybersecurity requirements, manage security documentation, conduct risk assessments, and support authorization processes.
ComputerGovernmentInformation ServicesInformation TechnologyNational SecuritySoftware
No H1B
Security Clearance RequiredU.S. Citizen Only
Responsibilities
Implement, manage, and enforce cybersecurity policies and procedures for assigned systems
Coordinate with stakeholders to support achieving Approval to Operate (ATO), continuous monitoring, and system decommissioning
Develop and maintain system security plans (SSPs), risk assessments, contingency plans, Security Controls Traceability Matrixes (SCTM), and related documentation
Monitor system security controls and continuously assess the security posture of the system
Ensure compliance with applicable federal and DoD cybersecurity frameworks (e.g., NIST RMF, JSIG)
Conduct vulnerability scans and recognize information system vulnerabilities
Review and analyze system audit logs to identify anomalous activity and potential threats to network resources
Participate in security control assessments and coordinate with the Information System Owner (ISO), System Administrator (SA), and Security Control Assessor (SCA)
Report security incidents, conduct incident response coordination, and support remediation activities
Maintain awareness of cybersecurity threats and recommend mitigation strategies
Track Plans of Action and Milestones (POA&Ms) and ensure timely remediation
Support customer inspections
Provide security guidance and awareness to system users and technical staff
Request and track standard and privileged system users
Qualification
Required
Active Top Secret Security Clearance
CompTIA Security+
Bachelor's degree in Cybersecurity, Information Technology, or a related field (or equivalent work experience)
Minimum of 3–5 years of experience in information system security, cybersecurity, or IT security management
Experience supporting classified systems under the DoD Joint SAP Implementation Guide (JSIG) or ICD 503
Strong knowledge of NIST SP 800-53, Risk Management Framework (RMF), and relevant DoD cybersecurity policies
Experience with as eMASS, ACAS, Tenable/Nessus, Splunk, ManageEngine, or other compliance and vulnerability scanning tools
Strong communication and documentation skills
Understanding of networking, system administration, and security architecture principles
Working knowledge of both Windows and Linux Operating systems
Experience with Security Technical Implementation Guides (STIGs) and Security Content Automation Protocol (SCAP) Compliance Checker
Preferred
Experienced with Microsoft Word and Excel
Experienced with Adobe Professional, or other PDF editing software
Benefits
Health and Wellness programs
Income Protection
Paid Leave
Retirement
Company
Leidos
Leidos is a Fortune 500® innovation company rapidly addressing the world’s most vexing challenges in national security and health.
10001+ employees
Funding
Current Stage
Public CompanyTotal Funding
unknown2025-02-20Post Ipo Debt
2013-09-17IPO
Leadership Team
James Carlini
Chief Technology Officer
Theodore Tanner
Chief Technology Officer
Recent News
MarketScreener
2025-12-16
2025-12-16
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