Principal Systems Administrator

Responsibilities

• Design, implement, maintain, and troubleshoot Windows and RHEL enterprise environments within a mission-critical, 24x7x365 classified environment.
• Manage Windows and Linux patching, vulnerability remediation, and compliance activities, including STIG implementation and SCAP/ACAS support.
• Design and maintain virtual infrastructure using VMware ESXi and vCenter, including VM lifecycle management and host upgrades.
• Administer core Windows services such as Active Directory, Group Policy, and certificate-based authentication.
• Collaborate with Cyber Security, Networking, and Engineering teams to resolve complex infrastructure and compliance challenges.
• Support operational needs in a fully onsite DoD closed-area environment.

Requirements

• University Degree or equivalent experience with a minimum of 5 years of relevant experience (or an Advanced Degree with 3 years of experience).
• Active and transferable U.S. government Secret security clearance required prior to start date.
• U.S. citizenship is required.
• Proven experience configuring, administering, and hardening Windows and RHEL servers.
• Experience with VMware virtualization.
• Experience with enterprise Windows services, including Active Directory and Group Policy.

Preferred Qualifications

• Experience supporting SIPRNET environments.
• Experience serving as a technical SME for patching, vulnerability remediation, or compliance initiatives.
• Familiarity with cybersecurity tooling such as ACAS, SCAP, Splunk, and STIG Viewer.
• Prior experience supporting DoD, defense, or highly regulated environments.

Benefits

• Relocation eligibility according to company policy.
• Comprehensive medical, dental, and vision insurance.
• 401(k) with company match.
• Paid time off, holidays, and parental leave.
• Employee assistance and scholar programs.

About the Company

RTX is a world-leading aerospace and defense company. Through its market-leading businesses—Collins Aerospace, Pratt & Whitney, and Raytheon—the company delivers advanced systems and services for commercial, military, and government customers worldwide, solving the world's most complex problems.