Principal Linux Systems Administrator (ONSITE)

Date Posted:

2026-06-16

Country:

United States of America

Location:

US-NH-PELHAM-PE1 ~ 50 Bush Hill Rd ~ BLDG 1

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:

Secret - Current

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

• You will provide System Administration in a heterogeneous Redhat 8 & 9 Enterprise Linux environment.
• You will utilize virtualization and containerization technologies, including VMware vCenter, vSphere, Horizon, ESXi, KVM, Podman, Docker, and Kubernetes/OpenShift.
• Collaborate with engineers, software developers, systems administrators, storage, networking, and high-performance computing teams to resolve complex infrastructure and integration challenges.
• Partner with cybersecurity teams to ensure continuous compliance with regulatory and security frameworks such as DFARS, RMF, and the NIST Cybersecurity Framework.
• Provide critical, on-site support for mission systems in a closed DoD area, responding to both planned and emergent tasks, with occasional work outside standard hours and up to 10% travel as required.
• Obtain and maintain DoD 8140 / 8570 certification (e.g., CompTIA Security+ or equivalent) within six months of hire.
• Demonstrates flexibility and adaptability to support business needs, including adjusting to shift changes

Qualifications You Must Have

• Typically requires: A University Degree or equivalent experience and minimum 5 years 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 Red Hat Enterprise Linux (RHEL), including system installation, administration, patching, and troubleshooting in enterprise environments.
• Experience with secure system configurations, system hardening, application settings, and tailoring Linux environments

Qualifications We Prefer

• Strong leadership, teamwork, communication (written and oral), collaboration, and organizational skills.
• Deep experience with Red Hat Enterprise Linux (RHEL) and its ecosystem, including authentication and identity services (SSSD, LDAP, Kerberos, NIS) and file sharing/integration services (Samba, NFS).
• Expertise with automation and configuration management tools such as Ansible and Red Hat Satellite, along with strong scripting skills in Bash, Python, Perl, or C to support provisioning, patching, and lifecycle management.
• Familiarity with enterprise storage systems (e.g., NetApp) and virtual desktop infrastructure (VDI) technologies such as Horizon, Profile Unity, and NVIDIA GPU virtualization (NLS, DLS).
• Proficiency with monitoring, vulnerability scanning, and compliance assessment tools (ACAS, Splunk, Nessus, SCAP, STIG, Nagios, SolarWinds) and working knowledge of security frameworks (CMMC, NISPOM, JAFAN, JSIG, DFARS, 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: Safety, Trust, Respect, Accountability, Collaboration, and Innovation.

• Relocation Eligibility – this role is relocation eligible according to the terms of our company policy

Learn More & Apply Now!

• Please ensure the role type defined below is appropriate for your needs before a