Information System Security Officer (ISSO), Senior (On-Prem & Cloud)

AMERICAN SYSTEMS is seeking aSenior Information System Security Officer (ISSO) to manage RMFexecution authorization and continuous monitoring for hybrid onpremises and cloud systems supporting classified government missions in Chantilly VA.

This role is ideally suited for a security leader who is detailoriented highly organized and confident guiding system owners and engineers through RMF execution authorization decisions and ongoing compliance in classified environments.

As an AMERICAN SYSTEMS Senior ISSO you will:

• Lead RMF execution for assigned systems from categorization through continuous monitoring.
• Maintain ICD 503 and FIPS 199 security artifacts supporting system authorization.
• Develop update and manage ATO packages and authorization documentation.
• Conduct or overseedaily audit log reviewsfor anomalous activity and report findings to the Government as soon as practical.
• Coordinate risk assessments and remediation activities with engineering teams.
• Enforce security policies and ensure ongoing compliance throughout the system lifecycle.
• Serve as the primary point of contact for security reporting to the COTR CO and Government security authorities.
• Support audits inspections reciprocity efforts and CORA activities.
• Support Privileged User Program and IA Workforce reporting requirements.

• Active TS/SCI clearance and current polygraph (required to be considered)
• Bachelors degree in Cybersecurity Information Assurance or a related STEM field
• 10 years of experience in RMF execution cybersecurity compliance and governance
• DoD 8570/8140 IAM Level III certification (e.g. CISSP CISM or CCSP)
• Experience managing ATO packages and supporting continuous monitoring
• Exposure to and understanding of hardening cloud assets
• Strong working knowledge of ICD 503 NIST SP 80053 and FIPS 199.
• Experience coordinating risk remediation across technical and operational teams.