ACAS Administrator

MANTECH • Doral, FL

4d • Onsite

About The Position

MANTECH is seeking a motivated, career- and customer-oriented Assured Compliance Assessment Solution (ACAS) Administrator to join its team in Doral, Florida. The role supports enterprise vulnerability management and security compliance by administering ACAS SecurityCenter/Tenable.sc and Nessus scanning infrastructure. The administrator works with system administrators, network engineers, and cybersecurity leadership to identify and remediate vulnerabilities, maintain scanning systems and controls, and improve vulnerability-management workflows.

The position is onsite and requires a current, active Top Secret security clearance. Physical requirements include remaining stationary for 50% of the time, occasionally moving around the office to access equipment and files, and frequently communicating with coworkers, management, and customers, including delivering presentations.

Requirements

• Bachelor’s degree in Cybersecurity, Computer Science, Information Technology, or a related field and at least 5 years of experience in vulnerability management or systems administration; or a master’s degree and at least 3 years of relevant experience; or an associate’s degree and at least 7 years of relevant experience; or a high school diploma and at least 9 years of relevant experience.
• Proven experience configuring, deploying, and maintaining ACAS SecurityCenter/Tenable.sc and Nessus scanners.
• Strong background in vulnerability management, credentialed scanning, patch verification, and risk assessment methodologies.
• Experience maintaining system baselines, configuration management controls, and technical reporting workflows.
• Experience creating, maintaining, and communicating complex technical documentation and vulnerability mitigation plans.
• Must hold a current, active Top Secret security clearance.
• Must be able to remain stationary for 50% of the time.
• Must occasionally move about inside the office to access file cabinets, office machinery, and similar items.
• Must frequently communicate with coworkers, management, and customers, potentially delivering presentations, and exchange accurate information.

Nice To Haves

• Relevant professional certifications such as CompTIA Security+, Tenable Certified ISO/Administrator, or CISSP.
• Prior experience supporting U.S. Military Command operations or Department of Defense enterprise technical environments.
• Familiarity with DoD STIG implementation, DISA vulnerability management requirements, and automated compliance tools.
• Ability to collaborate effectively across multidisciplinary engineering teams in dynamic operational settings.

Responsibilities

• Install, configure, maintain, and administer SecurityCenter/Tenable.sc and Nessus scanners across enterprise environments.
• Conduct routine automated and manual vulnerability scans, analyze results, and generate compliance reporting dashboards.
• Collaborate with system administrators, network engineers, and cybersecurity leadership to remediate detected system vulnerabilities.
• Maintain ACAS application baselines, scanner updates, feed updates, and configuration management controls.
• Create, update, and document custom scan policies, credentials management, and target zone assignments.
• Troubleshoot diagnostics, optimize system performance, and manage patches for vulnerability scanning infrastructure.
• Recommend and implement process improvements to streamline vulnerability-management workflows and security compliance.

What This Job Offers

• Job Type: Full-time
• Career Level: Mid Level