Linux System Administrator with Security Clearance

Job Description
CDIT is a technology solutions company supporting government and national security customers with secure, mission-focused IT solutions. We partner with highly skilled technical professionals to support complex environments where reliability, security, and operational excellence are critical. Our team values technical expertise, collaboration, and a commitment to supporting the missions of our customers. CDIT is seeking an experienced Linux System Administrator to support a secure, mission-critical enterprise environment.

This role will be responsible for the administration, maintenance, performance, and security of Linux-based infrastructure, with a focus on IBM Enterprise Storage, Veritas NetBackup, vulnerability management, system patching, and security compliance. The ideal candidate will bring strong hands-on Linux administration experience with the ability to troubleshoot complex infrastructure issues, optimize system performance, and support highly available environments. Responsibilities
Administer, maintain, and optimize Linux-based systems in a production environment.

Manage and support IBM Enterprise Storage solutions, ensuring availability and performance. Configure, monitor, and troubleshoot Veritas NetBackup for enterprise backup and recovery operations. Perform system patching and package management using YUM repositories. Execute and remediate vulnerability scans using Nessus, ensuring compliance with applicable security standards. Support and maintain STE/STIN processes and environments. Implement and maintain system security configurations, including applicable NSF frameworks and policies.

Perform routine system health checks and optimize performance, availability, access controls, and security. Support system optimization, performance tuning, and capacity planning. Proactively identify and troubleshoot potential system issues, risks, and operational roadblocks. Collaborate with infrastructure, security, and technical teams on system upgrades, audits, incident response, and operational requirements.
​Maintain system configurations, procedures, and compliance documentation.

Requirements
Required Skills & Qualifications
3+ years of hands-on Linux System Administration experience with RHEL, CentOS, or similar. Experience with IBM Enterprise Storage systems. Strong knowledge of Veritas NetBackup administration. Experience with Nessus vulnerability scanning and remediation. Proficiency with YUM package management and system patching. Familiarity with STE/STIN processes and NSF-related security frameworks. Strong understanding of Linux security, system hardening, and compliance. Strong troubleshooting and scripting skills using Bash, Python, or similar.

Active Top Secret clearance with Lifestyle Polygraph (LS Poly). Bachelor's degree in Computer Science, Information Technology, or a related field, or equivalent professional experience.

Preferred Skills & Qualifications
Red Hat Certified System Administrator (RHCSA) or equivalent Linux certification.
Experience supporting enterprise environments with high availability and disaster recovery requirements.
Experience with automation tools such as Ansible or Puppet.
Exposure to cloud or hybrid infrastructure environments.
Experience with system performance tuning and capacity planning.
Experience supporting secure or classified enterprise environments.