Principal Linux Systems Administrator

Security Clearance 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.

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.

Systems operate 24x7 and may require occasional work outside standard hours.

Position requires up to 5% travel and is a full‑time onsite role.

• 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 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.

• Experience supporting Windows systems in an enterprise environment.
• 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.
• Experience administering Windows Server technologies including WSUS or Exchange in a classified environment.
• Experience with data storage concepts, including SAN/NAS solutions and NFS implementations.
• Experience with 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 Power Shell for automation and tooling.
• HPC environment support experience.

• Medical, dental, vision, life insurance, short‑term and long‑term disability.
• 401(k) match, flexible spending accounts, and employee assistance program.
• Employee Scholar Program, parental leave, paid time off, and holidays.
• Annual short‑term and/or long‑term incentive compensation programs (paid only if covered by a collective‑bargaining agreement).

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 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.