Principal Linux Systems Administrator

Overview Raytheon is hiring for a Principal Systems Administrator to join the Digital Technology (DT) team in Tucson, AZ. The role supports classified information systems, collaborates across programs, and focuses on developing, implementing, and maintaining secure, cost-efficient environments for various classified programs. What You Will Do Provide IT systems administration in a heterogeneous Microsoft Windows and Red Hat Enterprise Linux environment, with a strong focus on RHEL systems management and lifecycle support. Experience with Linux fundamentals, including system, SELinux, networking, DNS, DHCP, and integration with Active Directory for authentication. Support interoperability between Linux and Windows systems using established identity management tools. Work as part of a collaborative team in a fast‑paced, air‑gapped, classified environment. Use advanced troubleshooting techniques to resolve moderate to complex technical issues involving operating systems, virtualized workloads, and hardware integration. Support Linux provisioning and configuration tasks including kickstart deployments, automated configuration using Ansible, package management, and container workloads using Podman. Assist with patching processes in a closed network environment where updates are manually introduced. Perform routine backup, restore, and RAID-related tasks as needed. Install and configure software packages requested by end users, ensuring systems remain compliant with cybersecurity requirements. Partner closely with Cybersecurity professionals to maintain required security posture, support RMF/NISPOM/JSIG-aligned processes, and deliver documentation, guidance, and training on advanced IT procedures. Develop solutions and technical documentation for a wide variety of Linux and Windows issues. Operate in a 24x7 environment with occasional outside-hours work. Travel up to 5% and work onsite full-time. Qualifications You Must Have Typically requires a University degree or equivalent experience with a minimum of 5 years of related experience, or an Advanced Degree with 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. Linux experience and/or Red Hat Enterprise Linux. Experience in one or more of the following areas: Active Directory administration, VMware virtualization, database, or network administration. Must be able to obtain DoD 8140/8570 certification (e.g., CompTIA Security+ CE or equivalent) within 6 months of start. Qualifications We Prefer Experience supporting Windows systems in an enterprise environment. VMware experience, including vCenter, ESXi, and VM lifecycle management. Current DoD 8140/8570 certifications (Security+ CE or equivalent OS-level certs). Experience with DoD RMF/NISPOM/JSIG/DFARS or related processes. Experience with Red Hat tools such as Ansible, Podman, SELinux, kickstart provisioning, and Linux automation. Experience administering Windows Server technologies including WSUS or Exchange in a classified environment. Experience with storage concepts (SAN/NAS, NFS) and containerization with Kubernetes or Rancher. Experience supporting engineers in software development, simulations, or hardware development workflows. Experience scripting in Bash, Ansible, or PowerShell for automation and tooling. HPC environment support experience. What We Offer RTX values Trust, Respect, Accountability, Collaboration, and Innovation. The salary range for this role is 86,800 USD - 165,200 USD. RTX is an Equal Opportunity Employer. Benefits may include medical, dental, vision, life insurance, disability coverage, 401(k) match, flexible spending accounts, paid time off, holidays, and more, with specifics dependent on the business unit and applicable agreements. RTX may require in-person interviews for selected steps of the process. This is a U.S.-based role. RTX is an aerospace and defense company serving commercial, military and government customers. It comprises Collins Aerospace, Pratt & Whitney, and Raytheon, with 195,000 employees. Headquarters: Arlington, Virginia. #J-18808-Ljbffr Prattwhitney