Senior Principal System Administrator

RTX

Senior Principal System Administrator developing and maintaining secure, cost-efficient environments across the Networked Security System for defense systems. Collaborating with teams to ensure IS stability and promote growth, redundancy, and resilience.

Posted 4/13/2026full-timeRemote • Arizona • 🇺🇸 United StatesSenior💰 $107,500 - $204,500 per yearWebsite

Tech Stack

Tools & technologies

Linux

About the role

Key responsibilities & impact

Utilize your knowledge and skills regarding System & Service integration to include, but not limited to, authentication protocols, patch management, network segregation, and vulnerability management.
Use multiple operating systems and hardware platforms to include OT (Operational Technology).
Work with the Cyber & Compliance Teams to maintain RTX standards and DFARS requirements which include assessments, implementation steps, and ensuring the integrity of the security authorization package.
Must be able to obtain Department of Defense Directive (DoDD) 8140 / 8570 Certification requirements (CompTIA Security+ CE or equivalent certification) within 6 months of start date.
Systems are operational 24x7 and occasionally require work effort beyond standard work hours.
Will manage and allocate private IP space for a segregated network and corporate IPs from another IT team for firewall connections on the corporate network.
Will set up VPNs on SonicWall devices between sites as needed for Technical Security and to support the IT Infrastructure Management Systems on this network.
Will image new workstations and join them to the private networks Active Directory (AD).

Requirements

What you’ll need

Typically requires a University degree or equivalent experience and a minimum of 8 years of prior relevant experience or an Advanced Degree in a related field and a minimum of 5 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 Windows and/or Linux Server Operating Systems (OS).

Benefits

Comp & perks

medical
dental
vision
life insurance
short-term disability
long-term disability
401(k) match
flexible spending accounts
flexible work schedules
employee assistance program
Employee Scholar Program
parental leave
paid time off
holidays

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills & Tools

system integrationservice integrationauthentication protocolspatch managementnetwork segregationvulnerability managementWindows Server OSLinux Server OSVPN setupActive Directory

Certifications

CompTIA Security+ CEDoDD 8140DoDD 8570