Principal System Administrator

This position supports enterprise systems administration across Microsoft Windows and Red Hat Linux platforms at RTX’s Tucson site. The administrator will maintain core services, resolve complex hardware and operating system issues, assist with patching and vulnerability remediation, and apply hardening and compliance controls in a classified environment. The role also includes documenting advanced procedures, training others, supporting helpdesk investigations, and contributing to round-the-clock system operations. It suits an experienced systems professional who is comfortable working onsite, collaborating across technical teams, and handling security-sensitive infrastructure. Candidates must be U.S. citizens with an active Secret clearance and be able to meet required certification standards.