Information Systems Security Engineer; ISSE) Linux​/RHEL

# Information Systems Security Engineer (ISSE) Linux/RHELCACI  
· caci.com Category:
Security Engineering

Location:

Sterling, VA, USSalary:
$86,600 – $181,800

Clearance:
TS/SCI## Quality of life

What the posting states. Hover or tap a perk to see the line it came from.
* Flexible PTO
* Learning budget

Job Title:

Information Systems Security Engineer (ISSE) Linux/RHELJob Category:
Security Time Type:
Full time Minimum Clearance Required to Start: TS/SCI Employee Type:
Regular Percentage of

Travel Required:

Up to 25%
Type of Travel:
Continental US *
*
* The Opportunity:

We are seeking a highly motivated, Linux-focused Information Systems Security Engineer (ISSE) to support the security, accreditation, and continuous monitoring of mission-critical systems operating within classified environments.

The ideal candidate combines cybersecurity engineering expertise with hands-on Red Hat Enterprise Linux (RHEL) administration skills. This position requires an individual comfortable working directly with Linux systems to implement security controls, troubleshoot configurations, remediate vulnerabilities, and support Risk Management Framework (RMF) compliance.

Working alongside systems engineers, software developers, and cybersecurity professionals, you will help design, implement, and maintain secure solutions supporting critical national security missions.

This position requires onsite support 100% of the time in Sterling, VA. Domestic and international travel opportunities may be available.

Responsibilities:

Perform hands-on security engineering, configuration, troubleshooting, and hardening of Red Hat Enterprise Linux (RHEL) systems

Implement, validate, and maintain DISA STIG compliance, including executing SCAP scans, analyzing findings, and remediating security vulnerabilities

Troubleshoot Linux security configurations involving SELinux, SSH, permissions, authentication, system services, and networking

Lead and support Assessment and Authorization (A&A) activities to achieve and maintain Authorization to Operate (ATO) under the Risk Management Framework (RMF)
Develop and maintain security documentation, including System Security Plans (SSPs), Security Assessment Reports (SARs), Security Control Traceability Matrices (SCTMs), and Plans of Action and Milestones (POA&Ms)
Conduct security assessments and continuous monitoring activities aligned with ICD 503, NIST 800-53, CNSSI, and applicable DoD requirements

Collaborate with systems, network, software, and Dev Ops engineers to integrate security requirements throughout the System Development Life Cycle (SDLC)
Evaluate system architectures, infrastructure changes, and software configurations to identify security risks and recommend mitigations

Develop Bash or Python scripts to automate security compliance, vulnerability assessments, and routine administrative tasks.

Qualifications:

Required:

Required5 years of combined experience in cybersecurity engineering, information assurance, Linux systems administration, or related technical disciplines

Minimum 2 years of hands-on Linux administration experience, preferably with RHEL 8/9

Practical Linux command-line proficiency, including file system management, permissions, user administration, package management (DNF/YUM), systemd services, log analysis, SSH, and basic network troubleshooting

Experience implementing Linux DISA STIGs, executing SCAP scans, and performing vulnerability remediation

Working knowledge of Linux security technologies, including SELinux, firewalld, authentication, and access controls

Experience with Bash scripting and/or Python for system administration or security automation

Strong understanding of RMF, ICD 503, NIST 800-53, and the ATO lifecycle

DoD 8570/8140 IAT Level II certification (Security CE, CySA ,…