Entry Level Linux System Administrator Jobs in Irvine, CA

Date Posted:

2026-08-25

Country:

United States of America

Location:

US-CA-FULLERTON-675 ~ 1801 Hughes Dr ~ BLDG 675

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 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.

We are currently seeking a Software Engineer II [Platform & Infrastructure Services] to join the Platform and Infrastructure Services (IS) team in the Air C2 (Command and Control) and Battlefield Sensors software department in Fullerton, California.

What you will do:

• Be part of the IS team that adopts DevOps processes and other best industry practices to integrate Commercial Off-the-Shelf platform products with existing and next-generation Command and Control systems to provide mission critical systems to our customers.

• Responsible for supporting multiple programs and multiple platforms within our C2 software product line

• Perform as an experienced individual contributor growing into the role of a technical subject matter expert, working as part of a high performing Integrated Product Team. 

• Responsibilities include COTS/FOSS installation, configuration, integration, and testing, automation of software builds and deployments, system performance tuning, system security and hardening, and limited technical mentoring and oversight.

• There may be travel opportunities to sites across the United States and internationally to support system integration and test activities.

• Able to take short term business trips (between 2 weeks to 2 months, depending on the circumstances) to the Kingdom of Saudi Arabia to interface with our customer and other RTX colleagues.

• Work onsite in Fullerton, CA

Qualifications You Must Have:

• Typically requires a degree in Science, Technology, Engineering or Mathematics (STEM) AND a minimum of 2 years of prior relevant experience.

• Experience with system deployment, automation/scripting and administration supporting mission critical systems on Windows or Linux.

• Experience with the integration of COTS/FOSS products for enterprise software deployments such as the following:

  • Windows Server (Active Directory, Exchange, SQL Server, PowerShell, RDP, DNS, WSUS)

  • Red Hat Enterprise Linux (Kickstart, bash, ssh/scp, configuration / administration)

• 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

Qualifications We Prefer:

• Experience in software development or system administration.

• Experience with Cyber Security and System hardening

• Enterprise IT System Architecture (multiple sites/datacenters/WAN backbone)

• Microsoft certification, i.e., Microsoft Certified Solutions Associate (MCSA), Microsoft Certified Solutions Expert (MCSE).

• RedHat / Linux certification, i.e., Red Hat Certified System Administrator (RHCSA), Red Hat Certified Engineer (RHCE).

• Experience with VMware vSphere (ESXi / vCenter)

• Cybersecurity certification, i.e., CISSP, CISA, Security+.

• Excellent interpersonal and communication skills, including ability to produce and present technical documentation.

• Experience working in a team-focused development environment, such as Agile/SCRUM.

What We Offer:

• A total rewards package that goes above and beyond with compensation; healthcare, wellness, retirement, and work/life benefits; career development and recognition programs.

• Some of the benefits we offer include parental (including paternal) leave, flexible work schedules, achievement awards, educational assistance and child/adult backup care.

• Relocation Eligible – Relocation assistance available

Learn More & Apply Now!

Please consider the following role type definition as you apply for this role.

• 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.

• This position requires a security clearance. DCSA Consolidated Adjudication Services (DCSA , an agency of the Department of Defense, handles and adjudicates the security clearance process. More information about Security Clearances can be found on the US Department of State government website here: https://www.state.gov/m/ds/clearances/c10978.htm 

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 75,800 USD - 144,200 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. 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.

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