Principal System Administrator Windows or Linux

Prattwhitney; El Segundo (CA); On-site; USD 95,500 - 181,700; Full time

Benefits offered by this job

Medical, dental, and vision coverage

401(k) plan with company match

Paid time off and holidays

Job summary

Prattwhitney is seeking an IT Systems Administrator in El Segundo, CA, to manage IT systems in both Windows and RedHat Enterprise Linux environments. The role requires an active Top Secret security clearance and the ability to troubleshoot and resolve technical issues.

Ideal candidates will have at least five years of relevant experience or three years with an advanced degree in IT systems, as well as the capability to implement security measures and ensure system reliability.

Qualifications

• Minimum five years of relevant experience in IT systems administration.
• Active transferable Top Secret security clearance required.
• Experience with Linux and/or Windows operating systems.

Responsibilities

• Provide IT systems administration in Windows and Linux environments.
• Resolve technical problems using troubleshooting techniques.
• Manage ESXi hosts, vCenter, and Windows domains.

Skills

Windows operating systems

Linux operating systems

Troubleshooting

Cross-team collaboration

Container solutions

Cybersecurity collaboration

Education

University degree or equivalent experience

Tools

Ansible

ESXi

vCenter

Windows Server

Active Directory

Job description

Overview

Date Posted: 2026-04-21

Country: United States of America

Location: El Segundo, CA – Building E04, 2006 E El Segundo Blvd

Position Type: On‑site (Full time, 100%)

U.S. citizenship is required for eligibility. An active, transferable Top Secret U.S. government security clearance must be available on day one.

What You Will Do

• Provide IT systems administration in a heterogeneous Microsoft Windows and RedHat Enterprise Linux environment.
• Apply troubleshooting techniques to resolve moderate‑to‑high‑scope technical problems, including hardware and operating system integration.
• Execute actions directed by senior staff and project management.
• Engage in cross‑team collaboration and align with leadership expectations.
• Design, develop, and deploy container solutions.
• Participate in all phases of engineering software installation and support, emphasizing testing, documentation, and acceptance.
• Manage ESXi hosts, vCenter, and Microsoft Windows domains.
• Apply Windows Server internal knowledge and Linux fundamentals, including DNS, DHCP, Active Directory, and server replication.
• Work with hardware RAID, encryption tools, and server management utilities.
• Perform data backup and restoration following industry best practices.
• Install and configure software applications requested by end users.
• Collaborate with cybersecurity professionals to maintain security requirements.
• Obtain Department of Defense Directive (DoDD) 8140 / 8570 certification (e.g., CompTIA Security+ CE) within six months of start date.
• Support systems operational 24×7, with occasional work beyond standard hours.
• Travel up to 10% of the year to other U.S. domestic locations as required.
• Maintain full‑time, on‑site presence.

Qualifications You Must Have

• University degree or equivalent experience, with a minimum of five years of relevant experience, or an advanced degree with at least three years of experience.
• Active and transferable Top Secret security clearance available prior to start date.
• U.S. citizenship required for security clearance eligibility.
• Experience with Windows and/or Linux operating systems.

Qualifications We Prefer

• Experience deploying Windows workstations and migrating end‑user data.
• Proficiency with cloning techniques.
• Experience using and guiding automation tools (e.g., Ansible).
• In-depth understanding of operating system concepts and implementations.
• Experience with Microsoft Windows Active Directory services administration and support, including user and computer object management and group policy.
• Experience with network services within Microsoft Windows environments (domain controller, DNS, DHCP).
• Support for desktop/workstation hardware.
• Experience with an IT incident or service‑request system.

Benefits & Compensation

• Annual salary range: 95,500 USD to 181,700 USD.
• Medical, dental, and vision coverage.
• Life insurance, short‑term and long‑term disability insurance.
• 401(k) plan with company match.
• Flexible spending accounts.
• Flexible work schedule.
• Employee assistance program.
• Employee Scholar Program.
• Parental leave, paid time off, and holidays.
• Potential eligibility for annual incentive compensation programs.
• Benefits dependent on business unit and collective bargaining agreement status.

Equal Employment Opportunity

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, veteran status, or any other protected class. RTX provides affirmative action in employment for qualified individuals with a disability and protected veterans in compliance with applicable laws.

Application Information

The application window is expected to close approximately 40 days from the posting date. The company may adjust this period as necessary based on candidate flow and business needs.