Information System Security Officer; ISSO - Fairfax, Virginia

Overview

Information System Security Officer (ISSO) – Fairfax, Virginia. This is a permanent, full-time position on-site at our headquarters in Fairfax, Virginia. Salary Range: $80,. Generous PTO, 401k, Health Insurance Package. Candidates must be a US citizen and able to obtain an active Department of Defense secret clearance.

In-Depth Engineering Corporation seeks a skilled ISSO to support the security posture of our on-premises systems. The ideal candidate will have hands-on experience with system hardening, Linux administration, and the Risk Management Framework (RMF), along with a solid understanding of network fundamentals and vulnerability management tools. This role will directly support system accreditation, continuous monitoring, and operational security compliance. We seek self-starters capable of independent effort as well as participation on a small team.

Note:

This description is for on-site work at our Fairfax, Virginia headquarters.

• Perform system hardening of Linux and other platforms using DISA STIGs, ensuring compliance across all assigned systems.
• Use STIG Viewer and SCAP Compliance Checker (SCC) to review, validate, and document security findings.
• Support RMF activities, including control implementation, evidence gathering, POA&M updates, and continuous monitoring tasks.
• Conduct vulnerability assessments using Nessus and assist in remediation planning.
• Maintain and update hardware baselines, ensuring accurate tracking of system configurations and assets.
• Build, configure, and manage KVM-based virtual machines.
• Support Linux system administration tasks for Red Hat systems.
• Manage and document user accounts, enforcing least privilege and access control best practices.
• Create and maintain network diagrams, data flow diagrams, and system architecture documentation.
• Collaborate with system owners, engineers, and cybersecurity leadership to ensure compliance with applicable policies and requirements.

• Must be US Citizen for consideration
• Bachelor s degree in computer science, cybersecurity, information systems, or a related technical field (or equivalent experience)
• 1-4 years of experience in an ISSO, cybersecurity analyst, or system administration role
• Hands-on experience with DISA STIGs, STIG Viewer, and SCAP tools
• Strong Linux experience (Red Hat Enterprise Linux or similar)
• Working knowledge of basic networking concepts, including subnets, routing, ports, and protocols
• Experience with Nessus or comparable vulnerability scanning tools
• Experience creating and maintaining system/network documentation
• Understanding of RMF and associated NIST controls
• Experience as a Linux administrator with familiarity managing user accounts
• Experience working with KVM virtualization environments

• Security+, GSEC, CYSA+, or other cybersecurity certifications
• Direct experience supporting DCSA, DoD, or other federal compliance requirements
• Experience with Ansible, Bash scripting, or other automation tools
• Familiarity with Windows OS hardening and STIGs (not required but beneficial)
• Strong written and verbal communication skills
• Ability to work independently and collaborate in a small team environment
• Detail-oriented with strong documentation habits
• Ability to prioritize tasks and manage competing deadlines

In-Depth Engineering provides a competitive package of salary and benefits, including medical, dental, and vision coverage, a Safe Harbor 401k program, generous Paid Time Off (PTO), STD, LTD, life insurance, and tuition assistance for higher education. Prospective employees will receive consideration without discrimination because of race, creed, color, sex, age, national origin, or handicap. We are an Equal Opportunity employer.