Information System Security Officer (ISSO)

Req ID: RQ213484 Type of Requisition: Regular Clearance Level Must Be Able to Obtain: Top Secret/SCI Public Trust/Other Required: None Job Family: Cyber and IT Risk Management Skills: Security Evaluations,Security Reviews,Security Testing Certifications: Certified Information Systems Security Professional (CISSP) International Information System Security Certification Consortium (ISC2) - International Information System Security Certification Consortium (ISC2) Experience: 5 + years of related experience US Citizenship Required: Yes Job Description: GDIT is seeking a highly skilled and multi-faceted Information System Security Officer (ISSO) for a critical contract role supporting a commercial cloud service provider's mission-critical systems. This position requires the employee to report full time on site in McLean, VA. The ideal candidate is a proactive and seasoned professional with extensive, hands-on experience navigating the FedRAMP, DOD Impact Level 6 (IL6), and Risk Management Framework (RMF) requirements for classified commercial cloud services and cross domain solutions. This role requires a unique blend of technical engineering prowess, security assessment and auditing skills, deep expertise in continuous monitoring, and the polish to communicate risk to executive leadership. You will be a key contributor to our Governance, Risk, and Compliance (GRC) program, supporting the Information System Security Manager (ISSM) and ISSO Lead in ensuring the unyielding security and integrity of mission-critical systems. The ISSO will support the following key areas - + RMF & Assessment and Authorization (A&A) + Security Engineering & System Hardening + Security Control Assessor (SCA) & Auditing + Continuous Monitoring & GRC Additionally, the ISSO will - + Support Assessment & Authorization (A&A) execution for classified commercial cloud service offerings, and Cross Domain Solutions (CDS) as needed, through the entire respective FedRAMP/DOD IL6 and/or RMF lifecycles to obtain and maintain the applicable authorizations. + Assist in maintaining a comprehensive body of evidence for A&A packages. + Support the monthly and overall FedRAMP/DOD IL6, DOD CDS as needed, and IC Continuous Monitoring requirements. + Work with security engineering to proactively identify and assess vulnerabilities related to scans, STIGs, security controls, etc. + Support assessment preparation for security control audits, traditional security reviews, and formal inspections, including preparing for and executing FedRAMP/IL6 third-party assessment organization (3PAO) assessments, DOD CDS assessments as needed, and IC assessments. (Potential to support DCSA classified space assessments.) + Meticulously review artifacts, logs, and system configurations to ensure they provide sufficient evidence of compliance. + Coordinate and/or participate in security testing and penetration testing activities to provide an independent validation of the system's security posture. WHAT YOUu2019LL NEED TO SUCCEED - REQUIRED: Bring your cyber expertise and drive for innovation to GDIT. The ISSO must have: u25cf Security clearance level: Must possess a current and active Top Secret. (Personnel may be asked if they agree to be submitted for polygraph.) u25cf Certifications : Must be DoD 8140 / 8570.01-M compliant u25cf Education : BA/BS Degree or equivalent experience in lieu of degree u25cf Experience : 5+ years of related experience u25cf Technical skills: ----- Expert-level knowledge of the complete NIST SP 800 series (especially 800-37, 800-53, 800-30) and risk management principles. ----- Progressive experience in information assurance and cybersecurity roles. ----- Direct, hands-on experience as an ISSO or ISSM, with a proven track record of successfully supporting ATO for classified systems under IL6, DoD RMF, and/or ICD 503 policies. ----- Extensive, hands-on experience navigating the FedRAMP, DOD Impact Level 6 (IL6), and Risk Management Framework (RMF) requirements for classified commercial cloud services and cross domain solutions. u25cf Location : Onsite in McLean, VA DESIRED QUALIFICATIONS: u25cf Certifications : CISSP (Certified Information Systems Security Professional) GDIT IS YOUR PLACE At GDIT, the mission is our purpose, and our people are at the center of everything we do. u25cf Growth: AI-powered career tool that identifies career steps and learning opportunities u25cf Support: An internal mobility team focused on helping you achieve your career goals u25cf Rewards: Comprehensive benefits and wellness packages, 401K with company match, and competitive pay and paid time off u25cf Community: Award-winning culture of innovation and a military-friendly workplace OWN YOUR OPPORTUNITY Explore a career in cyber at GDIT and youu2019ll find endless opportunities to grow alongside colleagues who share your focus on defending and protecting what matters. The likely salary range for this position is $124,093 - $166,750. This is not, however, a guarantee of compensation or salary. Rather, salary will be set based on experience, geographic location and possibly contractual requirements and could fall outside of this range. Our benefits package for all US-based employees includes a variety of medical plan options, some with Health Savings Accounts, dental plan options, a vision plan, and a 401(k) plan offering the ability to contribute both pre and post-tax dollars up to the IRS annual limits and receive a company match. To encourage work/life balance, GDIT offers employees full flex work weeks where possible and a variety of paid time off plans, including vacation, sick and personal time, holidays, paid parental, military, bereavement and jury duty leave. To ensure our employees are able to protect their income, other offerings such as short and long-term disability benefits, life, accidental death and dismemberment, personal accident, critical illness and business travel and accident insurance are provided or available. We regularly review our Total Rewards package to ensure our offerings are competitive and reflect what our employees have told us they value most. We are GDIT. A global technology and professional services company that delivers consulting, technology and mission services to every major agency across the U.S. government, defense and intelligence community. Our 30,000 experts extract the power of technology to create immediate value and deliver solutions at the edge of innovation. We operate across 50 countries worldwide, offering leading capabilities in digital modernization, AI/ML, Cloud, Cyber and application development. Together with our clients, we strive to create a safer, smarter world by harnessing the power of deep expertise and advanced technology.Join our Talent Community to stay up to date on our career opportunities and events at Opportunity Employer / Individuals with Disabilities / Protected Veterans

Created: 2026-01-26