Linux Systems Administrator

Date Posted: 2026-08-24 Country: United States of America Location: US-TX-MCKINNEY-513WC ~ 2501 W University Dr ~ WING C BLDG 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: DoD Clearance: Secret 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 freedoms and deter aggression, creating a safer, more secure world. Join us and help shape the future of aerospace and defense. What You Will Do : As a System Administrator, you will play a critical role in managing and maintaining a dynamic and heterogeneous Red Hat Enterprise Linux environment (versions 7, 8, and 9). Your responsibilities will include: Providing system administration in a fast-paced, technologically advanced environment while collaborating effectively within a team. Utilizing advanced troubleshooting techniques to resolve technical challenges of moderate to high complexity, including hardware and operating system (OS) integrations. Installing and configuring software applications based on end-user requirements. Partnering with Cybersecurity professionals to ensure compliance with security requirements and best practices. Performing monthly system patches and updates to maintain optimal functionality and security. Identifying and remediating vulnerabilities identified in SCAP scans and STIG findings to ensure system integrity. Ensuring antivirus definitions are up-to-date and verifying servers are properly reporting to Splunk. Managing user accounts, permissions, and access controls to maintain system security and compliance. Overseeing system backups, conducting regular tests to validate data restoration processes, and ensuring effective data retention. Qualifications You Must Have: Typically requires a University degree or equivalent experience and a minimum of 2 years of prior relevant experience, or an Advanced Degree in a related field. Active and transferable U.S. government issued Secret security clearance is required prior to start date. U.S. citizenship is required, as only U.S. citizens are eligible for a security clearance. Experience with Red Hat Enterprise Linux systems. Ability to obtain the Department of Defense Directive (DoDD) 8140 / 8570 Certification (e.g., CompTIA Security+ CE or equivalent) within six months of the start date. Qualifications We Prefer: Experience working in High-Performance Computing (HPC) environments. Familiarity with Artificial Intelligence (AI) solutions and implementations. Experience with databases such as MariaDB, Oracle, and SQL. Experience with Enterprise Active Directory (AD) and LDAP. Experience with security tools, including SCAP, Nessus, Splunk, Symantec, and other antivirus solutions, as well as system hardening practices. Background in supporting engineers in software, simulations, and hardware development. Experience troubleshooting and documenting real-time solutions to technical challenges. Scripting experience (e.g., Bash, Python, Ansible) and familiarity with Kickstart. Experience with virtualization technologies such as ESXi, VMware, and vSphere. Experience with NetApp/Ontap storage solutions. Expertise in infrastructure backup, restoration, disaster recovery, and business continuity processes. 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. Learn More & Apply Now! 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 68,900 USD - 131,100 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 Raytheon Technologies