Linux System Administrator

Job Title: Linux System Administrator Job Category: Information Technology Time Type: Full time Minimum Clearance Required to Start: None Employee Type: Regular Percentage of Travel Required: None Type of Travel: None The Opportunity CACI is searching for a Linux System Administrator to support the FEMA Office of the Chief Information Security Officer (OCISO) in Washington, D.C. In this role, you will play a crucial part in ensuring the security and operational resilience of FEMA’s Linux‑based infrastructure. You will collaborate with cybersecurity professionals, system owners, and enterprise administrators to implement and maintain secure server configurations across on‑premises and hybrid environments, directly contributing to safeguarding FEMA’s mission‑critical systems and data. Your responsibilities include securing Linux infrastructure, applying DISA STIGs or CIS Benchmarks, hardening systems, configuring firewalls and access controls, performing regular patching, software upgrades, and hotfixes, and proactively monitoring system performance, health, and capacity to ensure high availability and uptime. Responsibilities Secure Linux‑based infrastructure for the FEMA enterprise using DISA STIGs and CIS Benchmarks. Configure firewalls, access controls, and harden system services on Linux servers. Perform regular patching, software upgrades, and hotfixes while planning and testing patches to avoid operational disruptions. Remediate vulnerabilities and maintain system integrity. Ensure high availability and uptime for mission‑critical systems. Proactively monitor system performance, health, and capacity. Implement redundancy measures and prevent system failures. Manage user identities, authentication, and authorization; support ICAM tools, LDAP, and privileged access management. Apply the principle of least privilege and maintain system logging for auditing and compliance. Support vulnerability remediation and conduct security assessments. Research and maintain proficiency in tools, techniques, countermeasures, and trends in computer and network vulnerabilities, data hiding, and device security and encryption. Qualifications U.S. Citizenship required. FEMA EOD suitability or Current DHS or FEMA EOD preferred. 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. Desired 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. Pay Range $103,800 - $218,100. Salary is influenced by geographic location, Federal Government contract labor categories, specific skills and competencies, education, and certifications. Competitive compensation, benefits, and learning and development opportunities are offered. A comprehensive benefits package includes healthcare, wellness, financial, retirement, family support, continuing education, and time‑off benefits designed to support and protect employees and their families. CACI is an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, pregnancy, sexual orientation, age, national origin, disability, status as a protected veteran, or any other protected characteristic. #J-18808-Ljbffr