Information Systems Security Officer - TS/SCI with Polygraph

INFORMATION SYSTEMS SECURITY OFFICER

YOUR IMPACT

Own your opportunity to support national defense. Your work will help keep critical operations secure and connected across the global enterprise directly, contributing to a mission that protects our nation every day.

CIS is growing, and we invite both our experienced incumbents and new team members to be part of what’s next. Incumbents bring invaluable mission insight, while new talent adds fresh ideas and energy. Together, we’ll strengthen continuity and drive the next generation of innovation.

MEANINGFUL WORK AND PERSONAL IMPACT

As an Information Systems Security Officer (ISSO) supporting CIS, you will ensure the security, compliance, and continuous authorization of critical enterprise IT systems across multiple networks and security domains. You will oversee system security lifecycle activities, maintain accreditation documentation, identify and mitigate vulnerabilities, and serve as a trusted advisor on all matters involving system security posture. Your work strengthens cyber resilience, supports secure operations, and protects sensitive information across a complex, high visibility enterprise environment.

KEY RESPONSIBILITIES:

• Oversee day-to-day security operations for assigned systems, ensuring adherence to established security policies, baselines, and authorization requirements
• Manage and maintain system authorization packages, including security plans, network diagrams, STIG artifacts, vulnerability scans, and hardware/software inventories
• Develop, update, and track Plans of Action and Milestones (POA&Ms) to address system vulnerabilities, deviations, risk acceptance, and compliance gaps
• Coordinate security assessments, periodic reviews, monitoring activities, and updates in government security tools (e.g., SYSTEMS) as part of the continuous RMF lifecycle
• Investigate and analyze system security notifications, baseline changes, and configuration updates to ensure compliance with approved authorization requirements
• Support incident investigations, system recovery validations, and troubleshooting to ensure secure restoration of system operations
• Collaborate with engineering, operations, cybersecurity teams, and system owners to resolve security issues and maintain compliant system configurations
• Maintain audit readiness by performing periodic reviews of logs, configurations, and monitoring data to validate compliance and detect anomalies

WHAT YOU’LL NEED TO SUCCEED:

• CLEARANCE: Active TS/SCI clearance with Polygraph
• EDUCATION: Bachelor’s degree in cybersecurity, engineering, or an IT related field, or 10+ years of relevant IT experience in lieu of a degree
• CERTIFICATION: Meet DoD 8140 Information Assurance Workforce certification requirements (e.g., CISSP, etc.)
• Knowledge of National Institute of Standards and Technology (NIST) SP 80053, SP 80037, vulnerability management, and security control implementation
• Experience updating and maintaining security documentation in enterprise security tools (e.g., XACTA or equivalent)
• Strong understanding of system security auditing, configuration management, baseline control, and secure system operations
• Excellent analytical, communication, and coordination skills, with the ability to work across technical and cybersecurity teams
• US citizenship required
• LOCATION: Onsite

GDIT IS YOUR PLACE
At GDIT, the mission is our purpose, and our people are at the center of everything we do.
Growth: AI-powered career tool that identifies career steps and learning opportunities
Support: An internal mobility team focused on helping you achieve your career goals
Rewards: Comprehensive benefits and wellness packages, 401K with company match, and competitive pay and paid time off
Community: Award-winning culture of innovation and a military-friendly workplace

OWN YOUR OPPORTUNITY
Explore an enterprise IT career at GDIT and you’ll find endless opportunities to grow alongside colleagues who share your desire to drive operations forward.

#CIS