Linux System Administrator

CACI International Inc; Washington (District of Columbia); On-site; USD 90,000 - 190,000; Full time

Job summary

CA CI International Inc. is seeking a Linux System Administrator to support the FEMA Office of the Chief Information Security Officer in Washington, D.C.

You will secure Linux-based infrastructure, implement DISA STIGs or CIS Benchmarks, and maintain high availability across on-premises and hybrid environments. You will collaborate with cybersecurity professionals, system owners, and enterprise admins to manage patching, logging, and access controls while ensuring system integrity and threat

Qualifications

• U.S. citizenship required.
• FEMA EOD suitability or DHS/FEMA EOD preferred.
• BS/BA + 8 years of applicable experience or equivalent combination.
• Minimum 7 years of Linux system administration experience.
• 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.
• Experience with DISA STIGs and security hardening best practices.
• Knowledge of vulnerability remediation and patch management processes.
• Strong understanding of Linux security logging and auditing.
• Experience with VXRails or Zscaler.

Responsibilities

• Secure Linux-based infrastructure for FEMA enterprise across on-premises and hybrid environments.
• Apply DISA STIGs or CIS Benchmarks to reduce attack surfaces and enforce security controls.
• Configure firewalls, access controls, and harden system services.
• Patch, upgrade, and remediate vulnerabilities with minimal operational impact.
• Ensure high availability and uptime through monitoring and capacity planning.
• Support ICAM tools, LDAP, and privileged access management.
• Maintain least privilege principle and robust logging for auditing.
• Document administrative actions and contribute to security assessments.

Skills

Linux system administration

Security hardening

DISA STIGs / CIS Benchmarks

Vulnerability remediation

Firewalls & access controls

Identity management / ICAM

Logging & auditing

Hybrid on-prem / cloud

Education

BS/BA in a related field

Tools

LDAP

PAM

Ansible

Puppet

Chef

VXRails

Zscaler

Job description

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

CADI 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. The Linux System Administrator will maintain technical documentation for all administrative actions.

Qualifications

• U.S. Citizenship required
• FEMA EOD suitability or Current DHS or FEMA EOD preferred
• BS/BA + 8 years of applicable experience or equivalent combination
• 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
• Experience with DISA STIGs and security hardening best practices
• Knowledge of vulnerability remediation and patch management processes
• Strong understanding of Linux security logging and auditing
• Experience with VXRails or Zscaler

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

$90,300-$189,600

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.