Sr. Principal Systems Administrator, LINUX (ONSITE)

RTX (Raytheon); El Segundo (CA); On-site; USD 120,000 - 160,000; Full time

Benefits offered by this job

Relocation assistance

Job summary

RTX is seeking a Systems Administrator to join our onsite team in El Segundo, CA. The role supports classified IT infrastructures and requires an active DoD Secret clearance. You will manage servers, storage, access, backups, and workstation support in a multi-platform environment.

Responsibilities include installing/configuring infrastructure, mentoring junior admins, and ensuring 24x7 operations in a high-security setting. DoD RMF familiarity and readiness for after-hours work are expected.

Qualifications

• Experience using Linux, Windows Servers, and virtualization technologies.
• Typically requires a University Degree or equivalent experience and minimum 8 years prior relevant experience, or an Advanced Degree in a related field with minimum 5 years experience.
• U.S. Citizen and ability to obtain/maintain a DoD Secret clearance; clearance required after day 1.
• Must obtain DoDD 8140/8570 Certification (CompTIA Security+ CE or equivalent) in a reasonable time.

Responsibilities

• Provide IT systems administration in a heterogeneous RedHat Enterprise/Microsoft Windows environment.
• Lead and coordinate infrastructure installation and configuration.
• Collaborate with teams and mentor junior admins.
• Manage servers, storage, access, backups, and workstation support for classified programs.

Skills

Linux

Windows Server

Virtualization

Education

University Degree or equivalent

Advanced Degree in related field

Tools

Red Hat Enterprise Linux

Job description

Date Posted: 2026-10-29

Country: United States of America

Location: US-CA-EL SEGUNDO-E04 ~ 2006 E El Segundo Blvd ~ BLDG E04

Position Role Type: Onsite

U.S. Citizen, U.S. Person, or Immigration Status Requirements: The ability to obtain and maintain a U.S. government issued security clearance is required. 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 after 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.

Raytheon currently has an exciting IT position available that supports the Raytheon mission of making the world a safer place. We are currently seeking a Systems Administrator that will be working onsite in a highly collaborative, multi-platform and multi-disciplined environment. The Systems Administrator is required to have an active secret security clearance as they will be responsible for deploying and maintaining classified IT infrastructures. The candidate's day-to-day activities include but are not limited to: Server management; storage management; file server management; access management; data backup; software and license configuration; and workstation support. Each day in the life of a Systems Administrator can bring something new - building a new IT infrastructure for a group of engineers, restoring files due to an outage, updating virus definitions and security patches, teaming with our brilliant engineers on how to improve their processes, and more.

What You Will Do

• Provide IT systems administration in a heterogeneous RedHat Enterprise/Microsoft Windows and environment.
• Lead and coordinate infrastructure installation and configuration.
• Collaborate with teams and mentor junior admins.
• Work as a team member in a fast-paced technological environment. Use troubleshooting techniques to resolve technical problems of 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.
• 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
• Systems are operational 24x7 and occasionally require work effort beyond standard work hours
• Full-time 100% Onsite position

Qualifications You Must Have

• Experience using Linux, Windows Servers, and Virtual computing methods.
• Typically requires a University Degree or equivalent experience and minimum 8 years prior relevant experience, or an Advanced Degree in a related field and minimum 5 years experience
• U.S. Citizen - the ability to obtain and maintain a government active and existing Secret security clearance, required after day 1 as only U.S. citizens are eligible for a security clearance.
• Must be able to obtain Department of Defense Directive (DoDD) 8140 / 8570 Certification requirements (CompTIA Security+ CE or equivalent certification) within a reasonable amount of time

Qualifications We Prefer

• Active DoD T/S clearance, or the ability to obtain one
• Direct working experience with NISPOM, JAFAN, JSIG, DFARS and/or DoD/RMF
• In-depth working experience in RedHat Enterprise Linux
• Experience with data storage, NAS, and SAN technologies and solutions
• Scripting Experience (Ansible, Bash)

What We Offer

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