Principal System Administrator

Responsibilities

• Design, implement, and maintain secure Windows and Linux enterprise environments within a mission-critical, 24x7x365 classified setting
• Manage Windows Server, Windows 11, and RHEL 7/8/9 systems, including patching, vulnerability remediation, and STIG implementation
• Design and sustain virtual infrastructure using VMware ESXi and vCenter, including VM lifecycle management and host upgrades
• Engineer automation and deployment solutions using PowerShell, MECM/SCCM, and PXE for enterprise imaging and software deployment
• Administer core Windows services including Active Directory, Group Policy, and certificate-based authentication
• Collaborate with Cyber Security, DevSecOps, and Networking teams to resolve complex infrastructure and compliance challenges

Requirements

• University Degree or equivalent experience with a minimum of 5 years of relevant experience
• Proven experience administering and securing Windows and RHEL servers
• Hands-on experience with VMware virtualization
• Proficiency in PowerShell scripting and system hardening
• Active and in-scope Secret U.S. government security clearance
• U.S. citizenship is required

Preferred Qualifications

• Experience as a technical SME for patching, vulnerability remediation, or compliance initiatives
• Hands-on experience with MECM/SCCM, PXE boot services, and automated OS imaging
• Familiarity with cybersecurity tooling such as ACAS, SCAP, Splunk, and STIG Viewer
• Experience with NetApp storage, HPC environments, or SQL Server clustered configurations
• Experience supporting DevSecOps environments including Kubernetes and Rancher
• Ability to obtain DoD 8140/8570 certification (e.g., CompTIA Security+ CE) within 6 months

Benefits

• Relocation assistance available for eligible candidates
• Comprehensive medical, dental, and vision insurance
• 401(k) with company match
• Flexible spending accounts and employee assistance programs
• Paid time off, holidays, and parental leave

About the Company

RTX is a global aerospace and defense leader, comprising Collins Aerospace, Pratt & Whitney, and Raytheon. We solve the world's most complex problems by pushing the boundaries of science in fields like hypersonics, cybersecurity, and directed energy to protect and connect our world.