Senior Principal System Administrator - DoD Windows & Linux SME

RTX (Raytheon); Tewksbury (MA); On-site; USD 120,000 - 180,000; Full time

Job summary

RTX seeks a Sr. Principal System Administrator in Massachusetts to lead secure IT infrastructure across classified programs. You will design, implement, and sustain Windows and RHEL environments, ensuring high availability and DoD security compliance. A Secret clearance is required, with potential travel to other U.S.

locations up to 10%. This onsite role supports DoD closed-area operations. Responsibilities include collaborating with engineers, storage and HPC teams, and ensuring operational

Qualifications

• Typically requires a university degree or equivalent experience with senior-level IT background.
• Active and transferable U.S. government security clearance is required prior to start date.
• Experience administering Windows and Linux enterprise environments, with virtualization and storage skills.

Responsibilities

• Serve as SME for Windows and RHEL environments, leading design, implementation, troubleshooting, and sustainment.
• Collaborate across teams to deliver cost-effective IT solutions meeting current and future needs.
• Partner with customers, engineers, and HPC teams to design and resolve complex infrastructure challenges.
• Ensure high availability, reliability, and performance with proactive monitoring and improvement.
• Maintain cybersecurity compliance including RMF, NIST standards, and DoD requirements.
• Document procedures, mentor other admins, and support after-hours activities as needed.

Skills

Technical leadership

Problem solving

Communication

Education

Bachelor’s degree

Tools

Windows Server

RHEL

Active Directory

VMware

Storage management

Backup & Recovery

Job description

RTX seeks a Sr. Principal System Administrator in Massachusetts to lead secure IT infrastructure across classified programs. You will design, implement, and sustain Windows and RHEL environments, ensuring high availability and DoD security compliance. A Secret clearance is required, with potential travel to other U.S.

locations up to 10%. This onsite role supports DoD closed-area operations. Responsibilities include collaborating with engineers, storage and HPC teams, and ensuring operational