Sr. System Admin/System Engineer - Linux with Security Clearance

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 Senior Linux Systems Administrator / Engineer to support an Intelligence Community-wide mission environment and service.

This role will be responsible for the administration, configuration, maintenance, and operational support of Linux-based systems in a highly secure, mission-critical environment. The ideal candidate will bring strong expertise across Linux systems administration, application servers, virtualization, and security, with the ability to troubleshoot complex issues and support both virtual and physical infrastructure across enterprise environments.

Responsibilities • Administer, configure, maintain, and troubleshoot Red Hat Enterprise Linux (RHEL) and CentOS systems. • Install, configure, maintain, and troubleshoot JBoss and WildFly application server environments . • Create, configure, administer, and maintain VMware virtual machines . • Support physical and virtual server infrastructure throughout the system lifecycle. • Perform system monitoring, troubleshooting, patching, upgrades, and routine maintenance. • Support system security hardening and compliance requirements within a classified environment. • Support authentication and access-control technologies. • Assist with storage and networking configuration and troubleshooting. • Develop and maintain automation and administrative scripts using Shell and Python . • Support infrastructure automation activities using Red Hat Ansible . • Troubleshoot complex system, application, and infrastructure issues. • Maintain system documentation, procedures, and configuration information. • Collaborate with application, database, networking, security, and infrastructure teams to support operational requirements. • Provide after-hours operational support during required weekday evening and weekend shifts.

Requirements Required Skills & Qualifications • 10+ years of Linux Systems Administration/Engineering experience. • Strong RHEL/CentOS Linux administration experience. • Extensive JBoss/WildFly installation, configuration, and maintenance experience. • Hands-on VMware administration experience. • Current CompTIA Security+ certification. • Active Top Secret clearance with Full Scope Polygraph (FS Poly) . • Current or recent SYS3 PRIVAC level . • Availability for weekday evening and 12-hour weekend shifts as needed .

Preferred Skills & Qualifications • Red Hat Ansible experience. • Linux certification ( RHCSA, RHCE, or equivalent ). • Experience with storage, networking, security compliance, and authentication . • Shell and/or Python scripting . • Physical server administration. • Oracle Database/DBA experience. • Familiarity with JSON .