Linux Systems Administrator – Security & Compliance

CACI; National Harbor (MD); Hybrid; USD 103,800 - 218,100; Full time

Job summary

CACl? Correction: company is CACI. CACI is seeking a Linux System Administrator to support FEMA OCISO in Washington, D.C.

You will secure Linux-based infrastructure, implement security controls using DISA STIGs or CIS Benchmarks, and maintain system integrity across on-premises and hybrid environments. The role requires patching, hardening, vulnerability remediation, and proactive monitoring to ensure high availability of mission-critical systems, with privileges management and ICAM tooling

Qualifications

• U.S. Citizenship required.
• MA + 7 years of applicable experience in Linux system administration.
• Minimum 7 years of experience in Linux system administration.
• Demonstrated expertise in Linux infrastructure, DISA STIGs, and CIS Benchmarks.
• Experience with security hardening and vulnerability remediation.
• Knowledge of firewalls, access controls, and system service hardening.
• Experience with LDAP, PAM, and identity management solutions.
• Strong understanding of Linux security logging and monitoring.

Responsibilities

• Secure Linux-based infrastructure for the FEMA enterprise and leverage DISA STIGs or CIS Benchmarks to reduce attack surfaces.
• Configure firewalls, access controls, and harden system services; perform regular patching, software upgrades, and hotfixes on Linux servers.
• Remediate vulnerabilities and ensure system integrity while planning and testing patches to avoid operational disruptions.
• Ensure high availability and uptime for mission-critical systems; monitor system performance, health, and capacity.
• Support ICAM tools, LDAP, and privileged access management; implement least privilege and maintain system logging for auditing.

Skills

Linux administration

Security hardening

Vulnerability remediation

System monitoring

LDAP authentication

Education

Master's degree

Tools

DISA STIGs

CIS Benchmarks

Ansible

Puppet

Chef

Job description

CACl? Correction: company is CACI. CACI is seeking a Linux System Administrator to support FEMA OCISO in Washington, D.C.

You will secure Linux-based infrastructure, implement security controls using DISA STIGs or CIS Benchmarks, and maintain system integrity across on-premises and hybrid environments. The role requires patching, hardening, vulnerability remediation, and proactive monitoring to ensure high availability of mission-critical systems, with privileges management and ICAM tooling