ISSE: Linux/RHEL Security Engineer (TS/SCI)

CACI International Inc; Sterling (VA); On-site; USD 120,000 - 180,000; Full time

Job summary

CACI International Inc is seeking a Linux-focused Information Systems Security Engineer (ISSE) to support security, accreditation, and continuous monitoring of mission-critical systems in classified environments.

The role emphasizes hands-on RHEL administration, security controls implementation, RMF/DoD compliance, and collaboration with systems engineers, developers, and cybersecurity professionals to design and maintain secure solutions for national security missions. Onsite in Sterling, VA.

Qualifications

• 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
• Proficiency with Linux command line, including SSH, file permissions, user administration, package management, and services
• Experience implementing Linux DISA STIGs, executing SCAP scans, and remediation
• Working knowledge of RMF, ICD 503, NIST 800-53, and ATO lifecycle
• DoD 8570/8140 IAT Level II certification (Security+ CE, CySA+, SSCP, or equivalent)
• Bachelor's degree in a technical discipline or equivalent relevant experience
• Active TS/SCI clearance with SCI eligibility

Responsibilities

• Perform hands-on security engineering, configuration, troubleshooting, and hardening of RHEL systems
• Implement, validate, and maintain DISA STIG compliance and remediation
• Troubleshoot Linux security configurations (SELinux, SSH, permissions, services, networking)
• Lead A&A activities to achieve and maintain ATO under RMF
• Develop and maintain security docs: SSPs, SARs, SCTMs, POA&Ms
• Conduct security assessments and continuous monitoring per ICD 503 and NIST 800-53
• Collaborate with DevOps and engineering teams to embed security in SDLC
• Develop Bash/Python scripts to automate compliance and admin tasks

Skills

Cybersecurity experience

Information assurance

Linux systems administration

RHEL administration

Bash/Python scripting

Education

Bachelor's degree in a technical discipline

Tools

SCAP

Nessus

ACAS

Puppet

Ansible

Red Hat Satellite

FreeIPA/IdM

Job description

CACI International Inc is seeking a Linux-focused Information Systems Security Engineer (ISSE) to support security, accreditation, and continuous monitoring of mission-critical systems in classified environments.

The role emphasizes hands-on RHEL administration, security controls implementation, RMF/DoD compliance, and collaboration with systems engineers, developers, and cybersecurity professionals to design and maintain secure solutions for national security missions. Onsite in Sterling, VA.