Principal System Administrator- Must have a TS/SCI active clearance!

Date Posted:

2026-08-03

Country:

United States of America

Location:

US-CO-AURORA-S75 ~ 16800 E Centretech Pkwy ~ BLDG S75

Position Role Type:

Onsite

U.S. Citizen, U.S. Person, or Immigration Status Requirements:

Active and transferable U.S. government issued security clearance is required prior to start date.​ U.S. citizenship is required, as only U.S. citizens are eligible for a security clearance​

Security Clearance Type:

TS/SCI - Current

Security Clearance Status:

Active and existing security clearance required on day 1

At RTX, the world's largest aerospace and defense company, 185,000 great minds are united by purpose and inspired to make a difference solving the world’s most complex problems. With our three market leading businesses, world-class operations and investments in research and development, we offer capabilities and opportunity no one else can. Together, we push the boundaries of known science and find new ways to connect and protect our world. 

Raytheon brings the strength of more than 100 years of experience and renowned engineering expertise to meet the needs of today’s mission and stay ahead of tomorrow’s threat. We deliver solutions that help our nation and allies defend freedoms and deter aggression, creating a safer, more secure world. Join us and help shape the future of aerospace and defense.

Our Principal System Administrators, based in Aurora, CO infrastructure Workplace Services, collaborate with many teams to support exciting, critical programs with classified information system capabilities. Success in this role means you can develop, implement and maintain secure, cost-efficient environments across various classified programs. Program teams rely on your collaboration and guidance to define computing requirements and create end-to-end solutions to solve complex IT infrastructure problems.

What You Will Do:
Serve as a Principal Systems Administrator supporting Windows and Linux enterprise environments, responsible for implementation, maintenance, patching, and troubleshooting of Windows Server, Windows 11, RHEL 7/8/9, and virtualized infrastructure within a large-scale, mission-critical environment.

• Experience with Windows and Linux patching, vulnerability remediation, and compliance activities, including STIG/EVAL STIG implementation, SCAP/ACAS support, log collection, and close coordination with Cyber Security teams to maintain continuous compliance with DoD and regulatory requirements.
• Deploy, and maintain virtual infrastructure using VMware ESXi and vCenter, including VM lifecycle management, host upgrades, performance tuning, and support of critical production workloads.
• Administer and support core Windows services and integrations, including Active Directory, Group Policy, secure system configurations, certificate-based authentication, and customized user environments.
• Collaborate across Digital Technology, Engineering, Cyber Security, DevSecOps, Networking, Storage, and Tools teams to resolve complex infrastructure, integration, and compliance challenges, while operating independently with minimal oversight.
• Support both planned and emergent operational needs in a fully on-site DoD closed-area environment, including occasional after-hours support and up to 10% travel as required to meet program objectives.
• Must obtain DoDD 8140/8570 baseline certification (CompTIA Security+ or equivalent) within 6 months of starting date.
• 100% on site
• Up 5% travel

Qualifications You Must Have:

• Bachelor’s degree with a minimum of 5 years of relevant experience, or an advanced degree with a minimum of 3 years of relevant experience.
• Must have active and transferable U.S. government issued DoD Top Secret (TS/SCI) security clearance is required prior to start. U.S. citizen is required, as only U.S. citizenship is eligible for a security clearance
• Experience administering and securing Windows and RHEL servers.
• Experience with VMware virtualization.
• Experience with securing system configurations, system hardening.

Qualifications We Prefer:

• Experience serving as a primary point of contact for patching, vulnerability remediation, or compliance initiatives.
• Experience with enterprise Windows services, including Active Directory, Group Policy, and identity integration.
• Familiarity with cybersecurity and compliance tooling, such as SCAP, Splunk, STIG Viewer, and audit support processes.
• Experience supporting or integra