Principal Linux Systems Administrator (ONSITE)

Location: US-NH-PELHAM-PE1 ~ 50 Bush Hill Rd ~ BLDG 1 Date Posted: 2026-06-16 Country: United States of America Position Role Type: Onsite U.S. Citizen, U.S. Person, or Immigration Status Requirements: active and transferable U.S. government issued secret security clearance required, U.S. citizenship required. Security Clearance Type: Secret - Current Security Clearance Status: Active and existing security clearance required on day 1 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 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. Salary Range: $86,800 – $165,200 USD. This range is a good faith estimate representative of all experience levels. Benefits (medical, dental, vision, life insurance, short‑term and long‑term disability, 401(k) match, flexible spending accounts, flexible work schedules, employee assistance program, Employee Scholar Program, parental leave, paid time off, and holidays). Specific benefits are dependent on the specific business unit and any collective‑bargaining agreement. Eligible for annual short‑term and/or long‑term incentive compensation programs based on level and collective‑bargaining agreement. This is a U.S.-based role; appropriate pay structure and benefits apply to U.S. territories. RTX anticipates the application window closing approximately 40 days from the date the notice was posted. However, factors such as candidate flow and business necessity may require RTX to shorten or extend the application window. 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. #J-18808-Ljbffr Raytheon