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# Principal Linux Systems Administrator- Must have active TS/SCI Poly clearance

- **Company:** RTX
- **Location:** Aurora, CO, United States
- **Experience:** Experienced
- **Salary:** $86,800.0 - $165,200.0
- **Contract:** Permanent contract
- **Skills:** Active Directory, Amazon Web Services, Software Applications, Systems Engineering, Cloud Computing, Cyber Security, Software Debugging, Linux, Perl (Programming Language), Monitoring of Systems, Python (Programming Language), Lightweight Directory Access Protocols (LDAP), Linux System Administration, NetApp Applications, Citrix Systems, Oracle (Applications), Public Key Infrastructure, Shell Script, Data Logging, Diagnostic Tools, Operational Systems, Tools for Reporting, 3-tier Architectures, Vmware
- **Published:** October 22, 2026
- **Apply:** https://globalhr.wd5.myworkdayjobs.com/REC_RTX_Ext_Gateway/job/US-CO-AURORA-S75--16800-E-Centretech-Pkwy--BLDG-S75/Principal--Linux-Systems-Administrator--Must-have-active-TS-SCI-Poly-clearance_01883778

## About the Role

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, * Typically requires a bachelor's degree and minimum of 5 years of prior relevant experience or a master's degree and minimum of 3 years of prior relevant experience

 * Must have an active and transferable U.S. government issued TS/SCI Poly clearance prior to start date. U.S. citizenship is required, as only U.S. citizens are eligible for a security clearance.
 * Must have an active DoD 8570 IAT Level 2 certification (or higher) or acquire one within 30 days of start date. IAT Level 2 requires one or more of the following Professional Certifications: Security+ CE, CCNA Security, GICSP, GSEC, SSCP, CySA+, CND.
 * Experience with Linux Systems Administration
 * Experience configuring domain information utilities, such as Active Directory, Centrify, LDAP, * Experience presenting technical information to customers, clients and/or internal audiences
 * The ability to work effectively with frequent and direct customer interaction in a real-time operational environment
 * The ability to work under pressure in restoring high-priority systems back to operations
 * Ability to navigate, debug, and modify programs in an advanced programming language
 * Ability to write PERL, python, and shell scripts
 * Experience with storage products from Oracle/Sun/STK, EMC, IBM, NetApp, and/or DDN
 * Experience with virtual / cloud computing technologies using Citrix, VMware, and Amazon Web Services (AWS)
 * Working knowledge of thin-client technologies
 * Experience designing, implementing, and troubleshooting Public Key Infrastructure (PKI)Qualified

## Description

Principal Linux System Administrator based in Aurora CO, collaborates with many teams to support exciting, critical programs with classified information system capabilities. Success in this role means you will be responsible for monitoring and maintaining system health and security posture, directly supporting customer mission-critical capabilities. You will work closely with program developers and system engineers to research issues, determine root causes and implement solutions to system problems. This position is an 8x5 position with after-hours call-in responsibility. This position is 100% onsite in Stennis, MS., * Performs software application maintenance on mission systems running a variety of operating systems with Linux

 * Performs routine and preventative maintenance such as general computer tasks, application loads, disk utilization, system loading and system monitoring
 * Detects, isolates, documents, quick reports, and resolve system outages, or problems encountered during operations of the operational system baseline, which includes the collections of diagnostic data, restoring the system operation, development of workarounds, and other activities necessary for recovery of a system
 * Accurately document problems in logging and discrepancy reporting tools
 * Collect data describing the environment at the time of the failure and perform other activities in support of Tier 3 maintenance provider DR investigation and resolution
 * Perform system monitoring, analyzing and document performance and conduct trend analyses as required
 * Also support system engineering groups as required for ongoing analysis and integration efforts
 * Environment fluctuates between routine and urgent, depending on ongoing tasks, priorities, and performance of assigned systems
 * Works directly with the customer in most aspects of the day-to-day
 * 100% on site