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# Principal Systems Administrator (Onsite)

- **Company:** RTX
- **Location:** Andover, MA, United States
- **Experience:** Experienced
- **Salary:** $86,800.0 - $165,200.0
- **Contract:** Permanent contract
- **Skills:** Microsoft Windows, Active Directory, Cyber Security, System Configuration, Linux, Digital Technology, VMware ESX Servers, Performance Tuning, Red Hat Enterprise Linux, Security Content Automation Protocol, VMware Infrastructure, Virtualization Technology, VMware Virtualization, Software Vulnerability Management, Vcenter, Windows Services, Splunk, Network Server
- **Published:** August 4, 2026
- **Apply:** https://www.indeed.com/viewjob?jk=4c7e2d8bebd60f4c

## About the Role

* 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 configuring, administering, securing, and hardening Windows and RHEL servers
 * Experience with VMware virtualization
 * Experience with enterprise Windows services, including Active Directory, Group Policy, and identity integration.

Qualifications We Prefer

 * Experience supporting SIPRNET environment
 * Experience serving as a technical SME or primary point of contact for patching, vulnerability remediation, or compliance initiatives.
 * Familiarity with cybersecurity and compliance tooling, such as ACAS, SCAP, Splunk, STIG Viewer, and audit support processes.
 * Prior experience supporting DoD, defense, or highly regulated environments.

## Description

* Serve as a Principal Systems Administrator supporting Windows and Linux enterprise environments, responsible for the design, implementation, maintenance, patching, and troubleshooting of Windows, RHEL, and virtualized infrastructure within a large-scale, mission-critical environment operating 24x7x365.
 * Windows and Linux patching, vulnerability remediation, and compliance activities, including STIG/EVAL STIG implementation, SCAP/ACAS support, log collection, and close coordination with Cyber Security teams to maintain continuous compliance with DoD and regulatory requirements.
 * Design, deploy, and maintain virtual infrastructure using VMware ESXi and vCenter, including VM lifecycle management, host upgrades, performance tuning, and support of critical production workloads.
 * Administer and support core Windows services and integrations, including Active Directory, Group Policy, secure system configurations, certificate-based authentication, and customized user environments.
 * Collaborate across Digital Technology, Engineering, Cyber Security, Networking, Storage, and Tools teams to resolve complex infrastructure, integration, and compliance challenges, while operating independently with minimal oversight.
 * Support both planned and emergent operational needs in a fully on-site DoD closed-area environment, including occasional after-hours support and up to 10% travel as required to meet program objectives.
 * Work independently, prioritize competing demands, and execute with minimal direction in a fast-paced operational environment.
 * Full time 100% onsite position.


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