Information System Security Officer – ISSO

Leidos

Information Systems Security Officer overseeing cybersecurity posture and compliance for DoD information systems. Collaborating with cross-functional teams to implement security measures and maintain documentation.

Posted 6/25/2026full-timeLorton • Oklahoma, Virginia • 🇺🇸 United StatesSeniorLead💰 $107,900 - $195,050 per yearWebsite

Tech Stack

Tools & technologies

CloudCyber SecurityFirewalls

About the role

Key responsibilities & impact

Collaborate daily with the ISSM to provide expert cybersecurity guidance and recommendations.
Support the development, implementation, and maintenance of security policies, procedures, and documentation to ensure compliance with DoD security standards and regulations (e.g., NIST, RMF, FISMA, JSIG).
Oversee the security posture of DoD information systems, ensuring they meet cybersecurity requirements for confidentiality, integrity, and availability.
Perform risk assessments, vulnerability assessments, and security audits to identify system vulnerabilities and provide remediation strategies.
Manage and conduct continuous monitoring of security controls, ensuring the protection of classified and unclassified data.
Coordinate with cross-functional teams (engineering, IT, operations) to implement and enforce security protocols and best practices.
Ensure the accreditation process for DoD systems (e.g., RMF accreditation) is completed and continually maintained in compliance with all applicable requirements.
Act as the primary point of contact for security-related issues, assisting in incident response and reporting to senior management and government customers.
Provide security training and awareness programs for personnel involved in the operation of DoD systems.
Maintain and track security documentation, including system security plans (SSPs), risk assessments, and Plan of Actions & Milestones (POA&Ms).
Stay current with emerging cybersecurity threats, vulnerabilities, and trends to ensure the program adapts to evolving security challenges.

Requirements

What you’ll need

US Citizen with at least an active Top Secret security clearance with the ability to obtain a SCI prior to your start date.
Bachelor’s degree with 8+ years of experience or a Master’s degree with 6+ years of experience.
In-depth knowledge of DoD cybersecurity policies, frameworks, and compliance standards (e.g., NIST 800-53, RMF, FISMA, ICD 503/705, JSIG, DAAPM).
Must have a DoD 8140 Intermediate certification (e.g. Cloud+, Security+, etc.).
Experience with system security engineering, risk management, and vulnerability assessments.
Strong understanding of network security, security controls, and common cybersecurity tools (e.g., firewalls, IDS/IPS, SIEM, endpoint protection).
Ability to work independently and collaborate effectively with cross-functional teams.
Strong communication skills, including the ability to create and present detailed security reports to stakeholders.
Interest in continuous learning and professional development in cybersecurity.

Benefits

Comp & perks

Health and Wellness programs
Income Protection
Paid Leave
Retirement

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills & Tools

cybersecurityrisk managementvulnerability assessmentssecurity auditssystem security engineeringsecurity policiessecurity controlsincident responsesecurity trainingcompliance standards

Soft Skills

collaborationcommunicationindependent workcross-functional teamworkproblem-solvingleadershiporganizational skillsattention to detailadaptabilitycontinuous learning

Certifications

Top Secret security clearanceDoD 8140 Intermediate certificationCloud+Security+