Linux System Administrator

CACI International•National Harbor, MD

19h•$103,800 - $218,100•Onsite

About The Position

CACI is searching for a Linux System Administrator to support the FEMA Office of the Chief Information Security Officer (OCISO) in Washington, D.C. As a Linux System Administrator, you will play a crucial role in ensuring the security and operational resilience of FEMA's Linux-based infrastructure. You will work in a dynamic environment, collaborating with cybersecurity professionals, system owners, and enterprise administrators to implement and maintain secure server configurations across on-premises and hybrid environments. Your efforts will directly contribute to safeguarding FEMA's mission-critical systems and data. The Linux System Administrator will be responsible for securing Linux-based infrastructure supporting system reliability, hardening, patching, logging, and assessment readiness across on-premises and hybrid environments. This position requires leveraging DISA STIGs or CIS Benchmarks to reduce attack surfaces and implement security controls and configurations. The Linux System Administrator will configure firewalls, access controls, and harden system services while performing regular patching, software upgrades, and hotfixes on Linux servers. This role ensures high availability and uptime through proactive monitoring of system performance, health, and capacity.

Requirements

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.

Nice To Haves

FEMA EOD suitability or Current DHS or FEMA EOD preferred
Previous DHS or DoD experience
Experience with shell scripting (bash, python) and automation
Knowledge of configuration management tools (Ansible, Puppet, Chef)
Experience with hybrid cloud environments (AWS, Azure)
Familiarity with ICAM tools and privileged access management
Experience supporting 24/7 operations and disaster recovery

Responsibilities

Secure Linux-based infrastructure for the FEMA enterprise and leverage DISA STIGs or CIS Benchmarks to reduce attack surfaces while implementing security controls and configurations across Linux systems.
Configure firewalls, access controls, and harden system services, as well as performing 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, proactively monitoring system performance, health, and capacity, and supporting business continuity requirements.
Implement redundancy measures and preventing system failures.
Manage user identities, authentication, and authorization, and supporting ICAM tools, LDAP, and privileged access management.
Implement principle of least privilege and maintain system logging for auditing and compliance.
Support vulnerability remediation and conducting security assessments.
Research and maintain proficiency in tools, techniques, countermeasures, and trends in computer and network vulnerabilities, data hiding, and network and device security and encryption.