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

RTX; Richardson (TX); On-site; USD 87,000 - 165,000; Full time

Benefits offered by this job

Relocation assistance

Benefits package

Job summary

RTX in Richardson, TX is seeking a Principal Linux System Administrator to support a classified program. You will build, maintain, and secure IT systems and work with program developers and engineers to resolve complex issues. This onsite role requires TS/SCI clearance and DoD IAT Level 2 certification.

Relocation assistance is available, and RTX emphasizes trust, respect, accountability, collaboration, and innovation as core values. Salary range 86,800–165,200 USD, with comprehensive benefits.

Qualifications

• Active TS/SCI clearance required prior to start.
• Bachelor's degree with 5+ years of experience or Master's with 3+ years.
• Active DoD 8570 IAT Level 2 certification or higher.
• Experience with Red Hat Linux, patching, RPMs, performance tuning, and security hardening.
• Experience installing and administering VMware ESXi/vCenter.

Responsibilities

• Support Linux systems in a classified environment as a Linux System Administrator.
• Build, maintain and secure IT systems and support mission-critical capabilities.
• Collaborate with developers and system engineers to troubleshoot and resolve issues.
• Provide after-hours and on-call support as needed.
• Occasional travel and 100% onsite work in Richardson, TX.

Skills

Linux admin

VMware ESXi

Security hardening

LDAP

Patch management

Bash/Python scripting

DoD 8570 IAT Level 2

AWS/Cloud concepts

Windows administration

Education

Bachelor’s degree

Master’s degree

Tools

Red Hat Enterprise Linux

VMware ESXi/vCenter

Terraform

Ansible

Chef

LDAP

Job description

Date Posted:

2026-08-03

Country:

United States of America

Location:

US-TX-RICHARDSON-C27 ~ 1727 Cityline Dr ~ CITYLINE C27

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 with CI Poly - 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 freedom 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.

Raytheon Digital Technology is an organization that delivers for all of those who defend us by distributing capabilities, solutions, and processes to ensure alignment around program priorities supporting program execution. We support critical programs with unclassified, classified, and proprietary information system capabilities and create end-to-end solutions to solve complex digitalinfrastructure problems.

To achieve the mission of our customers, we strive to empower people with authority and responsibility and provide access to tools and resources that enable each employee to continuously improve their technical and leadership competencies while achieving professional and personal goals.

Principal Linux System Administrators , based in Richardson, TX infrastructureWorkplaceServices,collaboratewith manyteams tosupportexciting, critical programs with classified information system capabilities.Successin this role means you candevelop, implement and maintain secure, cost-efficientenvironmentsacross various classified programs. Program teams rely on yourcollaborationand guidance to define computing requirements andcreateend-to-endsolutionstosolvecomplexIT infrastructure problems.

What You Will Do:

• You will be supporting a Raytheon program in a classified environment as a Linux System Administrator.
• Responsibilities include building, maintaining, and securing Information Technology systems and directly supporting customer mission-critical capabilities.
• You will work closely with program developers and system engineers to research issues, determine root causes and implement solutions to system problems.
• Must be able to support occasional after-hour maintenance and on-call support
• Must be able to lift up to 35 pounds in support of hardware installations.
• Occasional travel may be required for installation support.
• This position is a 100% onsite role.

Qualifications You Must Have:

• Bachelor’s degree and a minimum of 5 years of prior relevant experience or a master’s degree and minimum of 3 years of prior relevant experience.
• Active and transferable U.S. government issued TS/SCI with polygraph security clearance is required prior to start date. U.S. citizenship is required, as only U.S. citizens are eligible for a security clearance.
• Must have an active DoD 8570 IAT Level 2 certification (or higher) on start date. IAT Level 2 requires one or more of the following Professional Certifications: Security+ CE, CCNA Security, GICSP, GSEC, SSCP, CySA+, CND.
• Experience administering Red Hat Enterprise Linux based systems with minimal support, to include patching, creating/maintaining RPM packages, performance tuning, networking, user management (LDAP), and security hardening.
• Installing, administering, and troubleshooting recent versions of VMware (ESXi and vCenter).

Qualifications We Prefer:

• Deployment and administration of systems in Amazon Web Services (AWS)/Commercial Cloud Services (C2S).
• Using and developing with automation tools/frameworks such as Terraform, Ansible, and Chef as well as scripting - particularly in Bash and Python.
• Experience administering Windows based systems.
• Demonstrated ability to work independently and troubleshoot problems with efficiency.
• Ability to effectively interact with external personnel on significant technical matters often requiring coordination between organizations and vendors.

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.

As part of our commitment to maintaining a secure hiring process, candidates may be asked to attendselect 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 86,800 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.

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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