Principal System Administrator

RTX (Raytheon); McKinney (TX); On-site; USD 90,000 - 130,000; Full time

Job summary

RTX in McKinney, TX is seeking an onsite IT Systems Administrator to manage Red Hat Enterprise Linux and Windows environments, lead Red Hat installation and configuration, and participate in engineering software installation and support.

The role requires 5+ years of relevant experience, active DoD Secret clearance, US citizenship, and experience with AD, VMware, backup software, and security-compliant operations; duties include 24x7 support and cross‑team collaboration.

Qualifications

• Experience with Red Hat Enterprise Linux and Windows administration.
• Knowledge of AD/WSUS and server backup/recovery suites.
• Active and transferable DoD Secret clearance is required before start date.
• U.S. citizenship is required for security clearance eligibility.

Responsibilities

• Provide IT systems administration in a heterogeneous RedHat Enterprise/Microsoft Windows environment.
• Lead and coordinate the RedHat Installation and configuration.
• Participate in all phases of Engineering software installation and support, with emphasis on testing, documentation, and acceptance phases.
• Collaborate with teams and mentor junior Linux admins.
• Apply understanding of Windows Server and Linux fundamentals including DNS/AD to support operations.
• Provide documentation and training on advanced IT processes and procedures; support classified programs.

Skills

RHEL

Active Directory

WSUS

VMware

BackupExec

NetBackup

Windows admin

Linux admin

Education

Bachelor's degree

Tools

VMware vCenter

Splunk

BackupExec

NetBackup

Job description

Date Posted:2026-09-21

Country:United States of America

Location:US-TX-MCKINNEY-513WC ~ 2501 W University Dr ~ WING C BLDG

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:DoD Clearance: Secret

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.

At Raytheon, the foundation of everything we do is rooted in our values and a higher calling - to help our nation and allies defend freedoms and deter aggression. We bring 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. Our team solves tough, meaningful problems that create a safer, more secure world.

What You Will Do

• Provide IT systems administration in a heterogeneous RedHat Enterprise/Microsoft Windows environment.
• Lead and coordinate the RedHat Installation and configuration.
• Participate in all phases of Engineering software installation and support, with emphasis on testing, documentation, and acceptance phases.
• Collaborate with teams and mentor junior Linux admins.
• Apply understanding and knowledge of Windows Server internals or Linux fundamentals to include DNS, DHCP, AD, and server replication methods.
• Work as a team member in a fast-paced technological environment. Use troubleshooting techniques to resolve technical problems of a moderate to high scope and complexity to include the integration of hardware and operating systems (OS).
• Participate and lead technical meetings with team members and program personnel representing the organization in functional area matters.
• Provide documentation and training on advanced IT processes and procedures and other tasks as assigned.
• Responsible for provisioning, installation/configuration, operation, and maintenance of systems hardware and software related to a Linux/Windows infrastructure for classified programs. Duties include, but are not limited to, server management (software and hardware); storage management (logical and physical); cross platform authentication and access management; data backup and restoration; software and license configuration; and workstation support.
• Work with Cybersecurity professionals to maintain security requirements and provide documentation on advanced IT processes and procedures and other tasks as assigned.
• Must be able to obtain Department of Defense Directive (DoDD) 8140 / 8570 Certification requirements (CompTIA Security+ CE or equivalent certification) within 6 months of start date.
• Systems are operational 24x7 and occasionally require work effort beyond standard work hours.
• Full time 100% Onsite position.

Qualifications You Must Have

• Typically requires a University degree or equivalent experience and a minimum of 5 years of prior relevant experience or an Advanced Degree in a related field and minimum 3 years' experience.
• Active and transferable U.S. government issued Secret security clearance is required prior to start date. U.S. citizenship is required, as only U.S. citizens are eligible for a security clearance.
• Experience with some of, but not limited to, the following technologies: Red Hat Enterprise Linux, Active Directory, WSUS, VMware, BackupExec, NetBackup, prior systems administration experience, Windows or Linux administration, Backup and Recovery enterprise suites.

Qualifications We Prefer

• Experience with Server architectures and troubleshooting methods and ability to assist in developing solutions and documentation to a variety of technical problems.
• Experience using VMWare vCenter, vSphere, Linux Desktops, Windows desktops (Windows 10, 11), Splunk and ESX and/or other virtual computing methods.
• Department of Defense Directive (DoDD) 8140 / 8570 Certification requirements (CompTIA Security+ CE or equivalent certification) and an Operating System Certification.
• Experience with NISPOM, JAFAN, JSIG, DFARS and/or DoD/RMF.
• Experience with data storage, NAS, and SAN techno