Principal Linux System Administrator

Date Posted: 2026-09-14 Country: United States of America Location: US-CA-GOLETA-H03 ~ 6380 Hollister Ave ~ BLDG H03 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. 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 has an available position for an experienced Linux System Administrator who will work in a highly collaborative, multi-platform and multi–disciplined environment. The System Administrator must possess a secret se curity clearance as they will be responsible for administering systems that contain classified data.  The candidate is responsible for provisioning, installation/configuration, operation, and maintenance of systems hardware and software related to a Linux 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.   What You Will Do: Implement and maintain an enterprise Linux environment including system administration, networking, performance monitoring/tuning, security hardening, and troubleshooting.  Employ disaster recovery and business continuity standards and practices, including working knowledge to backup data, restore systems, and troubleshoot.  Conduct short-term and long-term capacity planning to address network growth, technology modernization, and service availability.  Monitor security infrastructure and mitigate threats with enterprise security platforms (e.g. Ivanti, Symantec, Splunk, Tenable Nessus).  Leverage experience with Windows server, virtual servers, or Linux fundamentals that include DNS, DHCP, Active Directory, RAID, backup, restore and server replication.  Install and configure desktop applications and replace hardware end points.  Automation via scripting.  Partner with cross functional teams from applications, project, security, vendors, and executive stakeholders to plan, design, and implement new IT infrastructure.  Develop and maintain IT artifacts. Systems are operational 24x7 and occasionally require work effort beyond standard work hours.  Full time 100% Onsite position.  Qualifications You Must Have: Typically requires a University degree or equivalent experience and a minimum of 5 years of prior relevant experience or an Advanced Degree in a related field and minimum 3 years experience. 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, but not limited to, enterprise technologies and system administration related to RHEL, Active Directory, WSUS, VMware, Backup Exec, NetBackup, and Windows. Experience managing large Storage environments (HPE MSA, NetApp). Experience with Ivanti, Symantec, Splunk, Tenable and Nessus products.  Qualifications We Prefer: Must be able to obtain Department of Defense Directive (DoDD) 8140 / 8570 Certification requirements (CompTIA Security+ CE or equivalent certification) within 6 months of start date.  System deployment, administration, performance tuning, and monitoring.  Multi-tenancy architecture knowledge.  NetApp FAS, HPE MSA, NAS, and SAN technologies.  Experience with Window Servers, Active Directory, Group Policy, WSUS, Microsoft Configuration Manager (MCM) [formerly SCCM, MECM], and Exchange  Network and infrastructure services such as domain controllers, global catalogs, DNS, and DHCP  Practical knowledge of business continuity and disaster recovery practices  Experience with datacenter concepts and technologies  Direct working experience with NISPOM, JAFAN, JSIG, DFARS and/or DoD/RMF  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 95,500 USD - 181,700 USD. The salary range provided is a good faith estimate representa