Information Systems Security Officer (ISSO)

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 enterprise infrastructure services, you will safeguard critical information systems across multiple classified network domains. You will manage the full security lifecycle for assigned systems, ensure continuous compliance with cybersecurity standards, and help maintain resilient and secure mission enabling technologies. Your work strengthens system readiness, reduces risk, and ensures secure operations across globally distributed environments. 

KEY RESPONSIBILITIES 

• Serve as the primary cybersecurity advisor on system security posture, threats, vulnerabilities, and compliance requirements 
• Maintain and update security authorization packages, documentation, and baseline artifacts throughout the system lifecycle 
• Ensure systems retain active Authority to Operate (ATO) through continuous monitoring, updates, and alignment with security policies 
• Develop and manage POA&Ms, risk acceptance requests, waivers, and exceptions for identified vulnerabilities 
• Perform periodic system reviews, update security controls, and coordinate required security-driven configuration changes 
• Audit system logs and monitors outputs to identify compliance issues or abnormal activity and coordinate remediation 
• Oversee secure system recovery, validating restoration of approved security configurations 
• Manage system decommissioning activities, ensuring secure sanitization and proper documentation 
• Collaborate with engineers, system owners, and technical teams to validate controls and support accreditation updates 

WHAT YOU’LL NEED TO SUCCEED 

• Active TS/SCI clearance with CI Polygraph 
• Bachelor’s degree in an IT-related field, or 10+ years of relevant IT experience in lieu of a degree 
• Meet DoD 8140 Information Assurance Workforce certification requirements (e.g. Security+ CE) 
• Hands-on experience performing ISSO functions under the Risk Management Framework (RMF) 
• Strong understanding of NIST SP 80037, 80053, CNSSI 1253, and FISMA-aligned security practices 
• Experience managing authorization package documentation, vulnerability assessments, and STIG compliance 
• Ability to evaluate system risks, track remediation, and coordinate security efforts across engineering and operations teams 
• Familiarity with enterprise security logging tools (e.g., Splunk) and vulnerability monitoring tools 
• Strong communication, documentation, and collaboration skills 
• 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