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ACAS Administrator - Journeymen
Alexandria, VA
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We are seeking a Journeyman-level ACAS Administrator to support the implementation, configuration, and sustainment of Tenable/Nessus/ACAS across classified and unclassified DoD environments. You’ll play a key role in managing scanning tools, interpreting vulnerability results, maintaining dashboards, and mentoring junior staff as part of a Zero Trust cybersecurity initiative.

This is a hybrid position based at the Mark Center, with on-site work required 2–3 days per week for SIPR access.


Key Responsibilities

  • Support the design, deployment, and optimization of Tenable/Nessus/ACAS across hybrid environments (cloud + on-prem).
  • Oversee and train at least one junior ACAS team member; guide on-the-job learning.
  • Coordinate with system administrators, cybersecurity engineers, and stakeholders to maintain scanning operations.
  • Develop and maintain:
  • Scan policies and zones
  • Dashboards and visualization tools
  • Standard Operating Procedures (SOPs)
  • Interpret scan data and provide remediation recommendations.
  • Generate technical and functional reports and assist with risk management documentation.
  • Ensure system compliance with Federal cybersecurity standards (STIGs, FISMA, FIPS).
  • Respond to incidents, support system maintenance, and document all operational procedures.


Required Qualifications

  • 3+ years of hands-on experience with Tenable/Nessus/ACAS in a DoD environment.
  • Active Secret (Tier 3) clearance.
  • Security+ or IAT Level II

Experience with:

  • Running and interpreting ACAS scans
  • Configuring scan zones and dashboards
  • Working in both classified and unclassified systems
  • Federal cybersecurity compliance (STIGs, FISMA, FIPS)
  • Strong communication and interpersonal skills.
  • Ability to mentor junior team members and ensure quality and accuracy in reporting.


Preferred Skills

  • Exposure to Zero Trust architecture initiatives.
  • Experience supporting hybrid environments (cloud and on-prem).
  • Familiarity with risk documentation and real-world security operations.


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