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

Prattwhitney; Aurora (CO); On-site; USD 87,000 - 165,000; Full time

Benefits offered by this job

Medical insurance

Dental insurance

Vision coverage

Life insurance

401(k) match

Flexible schedules

Job summary

RTX is seeking a Principal Systems Administrator in Aurora, CO to support Windows and Linux environments in a classified DoD program. You will implement, maintain, patch, and troubleshoot core infrastructure and virtualized platforms in a secure, on-site setting.

The role requires a TS/SCI clearance, U.S. citizenship, and experience with AD, Group Policy, and secure configurations. Occasional after-hours support and travel may be required.

Qualifications

• Active DoD TS/SCI clearance required prior to start.
• U.S. citizenship required for security clearance eligibility.
• Experience administering Windows and RHEL servers and securing configurations.

Responsibilities

• Maintain and secure Windows and Linux enterprise environments.
• Patch and vulnerability remediation with STIG/EVAL STIG implementations.
• Manage VMware ESXi/vCenter lifecycle and performance tuning.
• Collaborate with Cyber Security, DevSecOps, Networking, and Storage teams.

Skills

Windows/Linux admin

VMware

Security hardening

Patch management

Education

Bachelor's degree +5 years

Advanced degree +3 years

Tools

VMware vSphere

Active Directory

SCAP/STIG tooling

Job description

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, RHEL7/8/9, 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 to10% travel as required to meet program objectives. Must obtain DoDD8140/8570 baseline certification (CompTIA Security+ or equivalent) within6 months of starting date. 100% on site Up5% travel.

Qualifications You Must Have:

• Bachelor’s degree with a minimum of5 years of relevant experience, or an advanced degree with a minimum of3 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 integrating with DevSecOps environments.

What We Offer:

Our values drive our actions, behaviors, and performance with a vision for a safer, more connected world. At RTX we value: Trust, Respect, Accountability, Collaboration, and Innovation. Relocation assistance is available.

The salary range for this role is86,800 USD -165,200 USD. The salary range provided is a good faith estimate representative of all experience levels. RTX considers several factors when extending an offer, including but not limited to, the role, function and associated responsibilities, a candidate’s work experience, location, education/training, and key skills.

• medical
• dental
• vision
• life insurance
• short-term disability
• long-term disability
• 401(k) match
• flexible spending accounts
• flexible work schedules
• employee assistance program
• Employee Scholar Program
• parental leave
• paid time off
• holidays

Specific benefits are dependent upon the specific business unit as well as whether or not the position is covered by a collective-bargaining agreement.

Hired applicants may be eligible for annual short-term and/or long-term incentive compensation programs depending on the level of the position and whether or not it is covered by a collective-bargaining agreement.

Payments under these annual programs are not guaranteed and are dependent upon a variety of factors including, but not limited to, individual performance, business unit performance, and/or the company’s performance.

This role is a U.S.-based role. If the successful candidate resides in a U.S. territory, the appropriate pay structure and benefits will apply.

RTX anticipates the application window closing approximately 40 days from the date the notice was posted. However, factors such as candidate flow and business necessity may require RTX to shorten or extend the application window.

RTX is an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, age, disability or veteran status, or any other applicable state or federal protected class. RTX provides affirmative action in employment for qualified Individuals with a Disability and Protected Veterans in compliance with Section 503 of the Rehabilitation Act and the Vietnam Era Veterans’ Readjustment Assistance Act.