Principal Linux System Administrator (Onsite)

RTX•Tucson, AZ

2d•Onsite

About The Position

At RTX, the world 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. 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. We are hiring for a Principal Systems Administrator to join our Digital Technology (DT) team in Tucson, AZ. The DT organization ensures that Raytheon teammates across the globe are able to communicate, collaborate and innovate for customer success. We create leading-edge technology solutions to prevent security threats, secure the integrity of our systems and support IT infrastructures around the world. The Principal System Administrators collaborate across the business 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.

Requirements

Typically requires a Bachelor’s degree and minimum of 5 years of relevant experience, or a Master’s degree with 3 years of experience
Linux experience and Red Hat Enterprise Linux Experience
Supporting Windows systems in an enterprise environment
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 requirements (CompTIA Security+ CE or equivalent) within 6 months of start
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

Nice To Haves

VMware experience, including vCenter, ESXi, and virtual machine lifecycle management
Active DoD TS/SCI with Polygraph or prior SCI/program eligibility
Current DoD 8140/8570 certifications, including Security+ CE or equivalent OS-level certifications
Experience with NISPOM, JAFAN, JSIG, DFARS, or Risk Management Framework (RMF) processes
Experience with Red Hat ecosystem tools such as Ansible, Podman, SELinux, kickstart provisioning, and Linux automation
Administering Windows Server technologies including WSUS or Exchange in a classified environment
Knowledge of data storage concepts, including SAN/NAS solutions and NFS implementations
Exposure to containerization and early-stage adoption of Kubernetes or Rancher
Experience supporting engineers working with software development, simulations, or hardware development workflows
Experience scripting in Bash, Ansible, or PowerShell for automation and tooling
HPC environment support experience

Responsibilities

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.
Apply solid understanding of Linux fundamentals, including systemd, 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.