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

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

Job summary

Raytheon in Richardson, TX is seeking a Sr. Linux System Administrator to support classified programs in an onsite environment. The role focuses on building, securing, and maintaining IT infrastructure and collaborating with program teams on computing requirements and solutions.

Candidates must hold a TS/SCI with CI Poly clearance, DoD 8570 IAT Level 2 certification, and a Bachelor's degree with 2+ years of relevant experience. Travel is occasional and on-site work is required.

Qualifications

• Bachelor's degree and 2+ years of relevant experience required.
• Active and transferable TS/SCI with CI Polygraph clearance required
• Active DoD 8570 IAT Level 2 certification (Security+ CE / CCNA Security / GICSP / GSEC / SSCP / CySA+ / CND) on start date
• Experience administering Red Hat Enterprise Linux systems (patching, RPMs, tuning, LDAP, security hardening)
• Installing and troubleshooting VMware ESXi and vCenter

Responsibilities

• Support Raytheon program in a classified environment as Sr. Linux System Administrator.
• Build, maintain, and secure IT systems and support mission-critical capabilities.
• Collaborate with developers and system engineers to research issues and implement fixes.
• Occasional after-hours/on-call support and up to 35 lb lifting for hardware installs.

Job description

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

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.

Sr. Linux System Administrators, based in Richardson, TX infrastructure Workplace Services, collaborate with many teams to support exciting, critical programs with classified information system capabilities. Success in this role means you can develop, implement and maintain secure, cost-efficient environments across various classified programs. Program teams rely on your collaboration and guidance to define computing requirements and create end-to-end solutions to solve complex IT infrastructure problems.

What You Will Do:

• You will be supporting a Raytheon program in a classified environment as a Sr. 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 and 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 an onsite role.

Qualifications You Must Have:

• Bachelor’s degree and a minimum of 2 years of prior relevant experience.
• Must have active and transferable U.S. government issued TS/SCI with CI 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: