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# Senior Information Systems Security Officer

- **Company:** ASGN Incorporated
- **Location:** Newington, VA, United States
- **Experience:** Expert
- **Salary:** $150,000.0 - $170,000.0
- **Contract:** Permanent contract
- **Skills:** Cyber Security, Package Management Systems, Security Content Automation Protocol, Software Vulnerability Management, Apex Code, SARS Software Products, Nessus
- **Published:** September 30, 2026
- **Apply:** https://www.clearancejobs.com/jobs/9202305/senior-information-systems-security-officer

## About the Role

* 8+ years of cybersecurity experience supporting RMF, A&A, ISSO, ISSM, or cybersecurity compliance functions.
 * Experience guiding systems through the full RMF lifecycle, including initial ATOs, reauthorizations, and continuous monitoring activities.
 * Hands-on experience developing and maintaining RMF artifacts including SSPs, SAPs, SARs, POA&Ms, Risk Registers, and Continuous Monitoring documentation.
 * Strong experience utilizing eMASS for package management, workflow coordination, control inheritance, and authorization package maintenance.
 * Experience conducting security control assessments and validating controls against NIST SP 800-53 requirements.
 * Experience supporting vulnerability management efforts utilizing ACAS, Nessus, DISA STIGs, SCC/SCAP, and remediation tracking.
 * Strong written and verbal communication skills with the ability to collaborate with cybersecurity teams, engineers, and government stakeholders.

## Description

Apex Systems is currently hiring for a Senior ISSO (RMF/A&A) with a leading federal defense contractor supporting a long-term US Special Operations Command (SOCOM) program. This position will support enterprise cybersecurity compliance efforts across a large, classified environment, helping guide systems through the Risk Management Framework (RMF) lifecycle while maintaining authorization compliance across multiple systems and enclaves.

Project Details / Mission Supported:

 * Support a large-scale enterprise IT and cybersecurity program serving the US Special Operations Command (SOCOM).
 * Perform RMF and Accreditation & Authorization (A&A) activities across 20+ classified systems and enclaves.
 * Guide systems through the full RMF lifecycle, including new authorizations, reauthorizations, continuous monitoring, security assessments, and vulnerability remediation efforts.