ACAS Administrator II

AMERICAN SYSTEMS

. Conduct routine scans using ACAS (Tenable Security Center, Nessus) to identify vulnerabilities, misconfigurations, and compliance gaps .

Posted 9/15/2026full-timeMcLean • Virginia • United StatesMid-LevelSenior💰 $100,000 - $120,000 per yearWebsite

Core Competencies

Role fit

Core Competencies

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Demonstrates expertise in vulnerability assessment and compliance reporting using ACAS and Nessus, along with a strong understanding of system patching and hardening in accordance with DoD and federal guidelines. Proven ability to communicate effectively within cross-functional teams and maintain comprehensive technical documentation.

Highest-signal resume keywords

ACAS Vulnerability AssessmentNessus ScanningIAT Level III CertificationIncident Response ProtocolsSystem Patching and Hardening

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills

Vulnerability AssessmentCompliance ReportingSystem HardeningTechnical DocumentationForensic AnalysisEvidence GatheringRemediation CoordinationBackup/Recovery SolutionsSecurity Patch ManagementConfiguration Management

Soft Skills

Effective CommunicationTeam CollaborationProblem-SolvingAdaptabilityAttention to Detail

Tools & Technologies

ACASTenable Security CenterNessusForensic ToolsDISA STIGsNISTRMFSANNASCross-Functional Team Collaboration

Certifications & Qualifications

DOD Interim Secret ClearanceDOD Secret ClearanceCASPCISSPCCNP SecurityCISAGCEDGCIHCCSP

Industry Keywords

DoD GuidelinesFederal GuidelinesSecurity Best PracticesVulnerability ScanningCompliance GapsIncident ResponseSecurity ProceduresEmerging ThreatsSystem MigrationsInternal Audits

About the role

Key responsibilities & impact

Conduct routine scans using ACAS (Tenable Security Center, Nessus) to identify vulnerabilities, misconfigurations, and compliance gaps
Coordinate remediation of vulnerability scan findings and track efforts for timely resolution and compliance with DISA STIGs, NIST, and RMF
Assist with security patching and system hardening according to DoD and federal guidelines
Ensure availability, reliability, and accuracy of ACAS components
Troubleshoot Security Center, Nessus scanners, and related plugins
Develop and update technical documentation, configurations, procedures, and standard operating procedures
Support system migrations and upgrades while minimizing downtime and maintaining security
Participate in incident response using ACAS scans and forensic tools
Contribute to containment, eradication, and recovery efforts under senior team guidance
Improve security procedures with cross-functional teams
Assist with internal and external information-systems audits and remediate findings
Monitor emerging threats, vulnerabilities, and security best practices

Requirements

What you’ll need

Must be a U.S. Citizen
Must hold active DOD Interim Secret or Secret Clearance
Must be certified with an IAT Level III Certification such as CASP, CISSP, CCNP Security, CISA, GCED, GCIH, or CCSP (CASP preferred)
Hands-on experience with ACAS Tenable Security Center and Nessus for vulnerability assessment and compliance reporting
Basic understanding of system patching, hardening, and backup/recovery solutions (SAN, NAS) in a mid-sized or enterprise environment
Familiarity with incident response protocols, including evidence gathering, forensic analysis, and remediation coordination
Proven ability to work effectively within cross-functional teams, communicating findings and coordinating security measures
Strong written and verbal communication skills, including experience maintaining documentation of configurations, processes, and procedures
Must be able to quickly master new technology/software for evaluating or subverting its security functionality

Benefits

Comp & perks

Healthcare benefits
Paid leave
Retirement plans
Insurance programs
Education and training assistance