Linux Administrator

CACI-posted 11 days ago
Full-time • Mid Level
Chantilly, VA
5,001-10,000 employees
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We are seeking a highly skilled and motivated Linux Administrator to join our Federal IT Operations team. The successful candidate will manage and support enterprise Linux systems that are mission-critical to national security operations. This role requires technical expertise, problem-solving ability, and collaboration with cross-functional teams in a secure, fast-paced environment.

  • Install, configure, secure, and maintain Linux servers (RHEL, CentOS, Ubuntu, or similar distributions).
  • Perform system administration tasks including user management, patching, monitoring, and troubleshooting.
  • Support system hardening and compliance with DoD/Federal security standards (STIGs, DISA, NIST).
  • Manage storage, backup, and recovery solutions for Linux environments.
  • Develop and maintain automation scripts (Bash, Python, Ansible, Puppet, or similar) for system provisioning and configuration management.
  • Support virtualization platforms (VMware, KVM, Hyper-V) and containerized workloads (Docker, Kubernetes).
  • Monitor system performance, availability, and capacity; implement proactive solutions.
  • Collaborate with network, security, and application teams to resolve system issues and improve reliability.
  • Maintain documentation of configurations, procedures, and system updates.
  • Participate in on-call support rotation and respond to critical system alerts.
  • Support accreditation and certification activities in alignment with RMF (Risk Management Framework).
  • Active Top Secret clearance (SCI eligibility strongly preferred).
  • 5+ years of experience in Linux system administration (RHEL, CentOS, or Ubuntu preferred).
  • Strong knowledge of system hardening, patch management, and security compliance.
  • Hands-on experience with shell scripting and automation tools (Bash, Python, Ansible, Puppet, or similar).
  • Experience with troubleshooting performance issues at system and application levels.
  • Familiarity with networking concepts (TCP/IP, DNS, DHCP, firewalls).
  • Understanding of storage systems (SAN, NAS, iSCSI, NFS) and backup/recovery solutions.
  • Ability to work effectively in a secure, team-oriented, mission-driven environment.
  • Bachelor’s degree in Computer Science, Information Systems, or related discipline (or equivalent work experience).
  • Experience in federal government or DoD environments.
  • Experience with DevOps practices and CI/CD pipelines.
  • Familiarity with cloud platforms (AWS, Azure, or GovCloud).
  • Experience with containerization technologies (Docker, Kubernetes, OpenShift).
  • Knowledge of Identity and Access Management (IAM) and integration with Linux systems.
  • Red Hat Certified System Administrator (RHCSA) or Red Hat Certified Engineer (RHCE) certification.
  • ITIL, Security+, or other relevant industry 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.
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