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# Senior ACAS Engineer / Team Lead - Tenable, Nessus, RHEL - Active Secret

- **Company:** Cornerstone Tech, Inc.
- **Location:** United States (Remote available)
- **Experience:** Expert
- **Salary:** $165,000 - $175,000
- **Contract:** Permanent contract
- **Skills:** Systems Engineering, CompTIA Security+, System Configuration, Federal Information Processing Standards (FIPS), Information Systems Security Architecture Professional, Red Hat Enterprise Linux, Software Vulnerability Management, SC Clearance, Nessus, Vulnerability Analysis
- **Published:** October 29, 2026
- **Apply:** https://www.indeed.com/viewjob?jk=a8e1a9bed9fc9ba9

## About the Role

* Active Secret clearance
 * DoD 8570/8140 IAT Level II certification (e.g., Security+)
 * 5+ years of experience in systems engineering or vulnerability management
 * Hands-on experience administering Tenable/Nessus/ACAS
 * Strong Red Hat Enterprise Linux administration and troubleshooting skills
 * Working knowledge of networking, including ports, protocols, and connectivity
 * Strong communication and team leadership skills, * Experience with complex DoD security architectures, including classified environments
 * Experience leading or training technical staff
 * Experience supporting RMF/ATO packages
 * Familiarity with STIG implementation and compliance reporting

Working Environment

This is a fully remote position. The selected candidate must comply with all customer security, equipment, access, and remote-work requirements., * How many years of experience do you have administering ACAS, Tenable Security Center, or Nessus? Which tools did you personally install, configure, upgrade, or maintain?

 * Do you have hands on experience administering and troubleshooting Red Hat Enterprise Linux servers? Briefly describe your responsibilities.
 * Have you led a technical support team, trained junior engineers, and provided technical updates directly to government customers? Briefly describe your experience.

Experience:

 * systems engineering or systems administration: 5 years (Required)

License/Certification:

 * CompTIA Security+ (Required)

## Description

Cornerstone Technology Enterprises is seeking a Senior ACAS Engineer to lead vulnerability scanning operations for a mission-critical Department of Defense government customer. You will own the design, engineering, and day-to-day management of Tenable/Nessus/ACAS solutions across unclassified and classified environments, and you will lead a small team of ACAS support engineers.

This is a hands-on technical leadership role. You will administer Tenable applications on Red Hat Enterprise Linux, keep scan coverage accurate and on schedule, and serve as the government customer's go-to expert on ACAS resource needs, dependencies, and risks., * Design, implement, optimize, and sustain Tenable/Nessus/ACAS solutions in unclassified and classified DoD environments

 * Administer and troubleshoot Tenable applications hosted on Red Hat Enterprise Linux
 * Develop and maintain scan policies, scan zones, and dashboards, and engineer new capabilities as coverage scope and mission needs change
 * Identify and clearly document the ports, protocols, and connectivity dependencies that scanning requires
 * Interpret findings, recommend remediation, and support RMF processes and authorization packages
 * Configure systems to meet STIG, FISMA, and FIPS requirements, and create and maintain SOPs
 * Lead, train, and mentor a small team of ACAS support engineers, and make sure the team delivers accurate scan results on time
 * Brief the government customer on resource needs, technical risks, and project and operational status, and produce technical and team-lead reports