[Skip to main content](#main-content) [ OpenNash ](https://opennash.com/) / [Jobs](https://jobs.opennash.com/) [ 01 Search jobs](https://jobs.opennash.com/search/)[ 02 Companies](https://jobs.opennash.com/explore/)[ 03 Hiring report](https://jobs.opennash.com/reports/hiring/)[ 04 AI assistants](https://jobs.opennash.com/connect/)[ 05 How it works](https://jobs.opennash.com/methodology/) RTX # Sr. Principal Systems Administrator, LINUX (ONSITE) On-site Full-time Senior individual contributor Design Listed on RTX’s official careers site. Posted October 30, 2026. Check that it is still open and apply there. [Apply on RTX’s careers site →](https://globalhr.wd5.myworkdayjobs.com/REC_RTX_Ext_Gateway/job/US-CA-EL-SEGUNDO-E04--2006-E-El-Segundo-Blvd--BLDG-E04/Sr-Principal-Systems-Administrator--LINUX--ONSITE-_01885497) [OpenNash Jobs](https://jobs.opennash.com/) / [RTX](https://jobs.opennash.com/companies/rtx/) / Sr. Principal Systems Administrator, LINUX (ONSITE) ## 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 Learn More & Apply Now Please ensure the role type defined below is appropriate for your needs before applying to this role. This position is classified as: Onsite: Employees who are working in Onsite roles will work primarily onsite. This includes all production and maintenance employees, as they are essential to the development of our products. As part of our commitment to maintaining a secure hiring process, candidates may be asked to attend select steps of the interview process in-person at one of our office locations, regardless of whether the role is designated as on-site, hybrid or remote. The salary range for this role is 118,300 USD - 224,900 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. Hired applicants may be eligible for benefits, including but not limited to, 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, and 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. ### Privacy Policy and Terms Click on this link to read the Policy and Terms ## At a glance - Posted by the employer: Oct 30, 2026 - First seen by OpenNash: Nov 11, 2026 - Last checked: Nov 11, 2026 - Listed for: 12 days - Work arrangement: On-site - Employment type: Full-time[Apply on RTX’s careers site →](https://globalhr.wd5.myworkdayjobs.com/REC_RTX_Ext_Gateway/job/US-CA-EL-SEGUNDO-E04--2006-E-El-Segundo-Blvd--BLDG-E04/Sr-Principal-Systems-Administrator--LINUX--ONSITE-_01885497) ## Hiring at RTX - Open jobs: 4,634 - New in the last 7 days: After two weekly collections - Tracked since: Jul 14, 2026 [All RTX jobs](https://jobs.opennash.com/companies/rtx/) · [Weekly hiring report](/reports/hiring/) ## More jobs at RTX ### [System Administrator - Secret clearance](https://jobs.opennash.com/companies/rtx/jobs/c56e84a39acd6e868771/) ### [Systems Administrator (Linux) (Onsite)](https://jobs.opennash.com/companies/rtx/jobs/e33efb6149d5260fd6d2/) MCKINNEY, TX, US ### [Sr. Principal Systems Administrator, WINDOWS (ONSITE)](https://jobs.opennash.com/companies/rtx/jobs/917ee4a3adfb812e9d84/) MCKINNEY, TX, US ### [Sr. Principal Systems Engineer - Missile Guidance, Navigation, & Control Engineer](https://jobs.opennash.com/companies/rtx/jobs/ae5c676a9255a79956e5/) TUCSON, AZ, US ### [Sr. Principal Systems Engineer - STARS Architecture Modernization (Onsite)](https://jobs.opennash.com/companies/rtx/jobs/ac6a31ebb74299dbb5bf/) ## Similar jobs at other companies ### [Linux Server Administrator](https://jobs.opennash.com/companies/ntt/jobs/6a42431b76e412b7a860/) NTT · Remote, TX, US, United States ### [Linux Systems Administrator - SA2](https://jobs.opennash.com/companies/lockheed-martin/jobs/0fd100d3c090dcaaea9b/) Lockheed Martin · Fort Meade, MD ### [Windows & Linux Systems Administrator Staff](https://jobs.opennash.com/companies/lockheed-martin/jobs/472732f30c68b4ee0774/) Lockheed Martin · Fort Meade, MD ### [Linux Administrator](https://jobs.opennash.com/companies/bae-systems/jobs/538f67ac8135ba560b14/) BAE Systems · Aberdeen Proving Ground, Maryland, United States ### [Linux System Administrator](https://jobs.opennash.com/companies/bae-systems/jobs/f7b9840d699b50fbfb35/) BAE Systems · Wallops Island, Virginia, United States [Design jobs](/functions/design/) OpenNash lists jobs from employers’ own careers sites and does not handle applications. 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