Information Systems Security Engineer; ISSE) Linux​/RHEL

## Information Systems Security Engineer (ISSE) Linux/RHELSterling, VA, USApply Now Find out how well you match with this jobJob :
334367

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:

* Required  5+ 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+, SSCP, or equivalent applicable certification)  Bachelor's degree in a technical discipline or…