Linux System Administrator

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

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. 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.

Responsibilities:

The Linux System Administrator will 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. This position requires configuring firewalls, access controls, and hardening system services, as well as performing regular patching, software upgrades, and hotfixes on Linux servers. The Linux System Administrator will remediate vulnerabilities and ensure system integrity while planning and testing patches to avoid operational disruptions. Responsibilities include ensuring high availability and uptime for mission‑critical systems, proactively monitoring system performance, health, and capacity, and supporting business continuity requirements. The position involves implementing redundancy measures and preventing system failures, managing user identities, authentication, and authorization, and supporting ICAM tools, LDAP, and privileged access management. The Linux System Administrator will implement principle of least privilege and maintain system logging for auditing and compliance. This position requires supporting vulnerability remediation and conducting security assessments while researching and maintaining proficiency in tools, techniques, countermeasures, and trends in computer and network vulnerabilities, data hiding, and network and device security and encryption.

Qualifications:

• U.S. Citizenship required
• FEMA EOD suitability or Current DHS or FEMA EOD preferred
• 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.

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

What You Can Expect:

A culture of integrity.

At CACI, we place character and innovation at the center of everything we do. As a valued team member, you’ll be part of a high‑performing group dedicated to our customer’s missions and driven by a higher purpose – to ensure the safety of our nation.

An environment of trust.

CACI values the unique contributions that every employee brings to our company and our customers - every day. You’ll have the autonomy to take the time you need through a unique flexible time off benefit and have access to robust learning resources to make your ambitions a reality.

A focus on continuous growth.

Together, we will advance our nation’s most critical missions, build on our lengthy track record of business success, and find opportunities to break new ground — in your career and in our legacy.

Pay Range

There are a host of factors that can influence final salary including, but not limited to, geographic location, Federal Government contract labor categories and contract wage rates, relevant prior work experience, specific skills and competencies, education, and certifications. Our employees value the flexibility at CACI that allows them to balance quality work and their personal lives. We offer competitive compensation, benefits and learning and development opportunities. Our broad and competitive mix of benefits options is designed to support and protect employees and their families. At CACI, you will receive comprehensive benefits such as; healthcare, wellness, financial, retirement, family support, continuing education, and time off benefits.

The proposed salary range for this position is:

$103,800 - $218,100

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.