Senior Principal System Administrator - DoD IT & Security

Prattwhitney; Tewksbury, Concord (MA, MA); On-site; USD 108,000 - 205,000; Full time

Benefits offered by this job

Medical

Dental

401(k) match

Flexible work schedules

Paid time off

Job summary

RTX seeks a Sr. Principal System Administrator (Manager, Information Workplace Services) in Tewksbury, MA to lead secure, cost-efficient infrastructure for classified programs.

You will design, implement, and sustain Windows and RHEL environments, collaborating with multiple teams to meet security and operational requirements. Role requires DoD RMF/NIST compliance experience, active Secret clearance, and willingness to work onsite with occasional after-hours support.

Qualifications

• 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 minimum 5 years experience.
• Active and transferable Secret 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.
• Experience administering Microsoft Windows and Red Hat Enterprise Linux (RHEL) server, desktop, or virtualized environments.
• Experience supporting enterprise infrastructure services and secure computing environments, including areas such as Active Directory, identity and access management, system configuration, patching, troubleshooting, virtualization, storage, backup and recovery, networking, or lifecycle management.

Responsibilities

• Serve as a Subject Matter Expert (SME) for Microsoft Windows and Red Hat Enterprise Linux (RHEL) environments, providing technical leadership in the design, implementation, troubleshooting, and sustainment of physical and virtual infrastructure.
• Collaborate across Digital Technology and supported programs to develop and deliver cost-effective hardware and software solutions that meet current and future business needs while leveraging industry best practices.
• Partner with customers, engineers, system administrators, storage architects, network engineers, tools teams, and HPC teams to design solutions and resolve complex infrastructure challenges.
• Ensure high levels of system availability, reliability, and performance through proactive monitoring, infrastructure management, troubleshooting, and continuous improvement.
• Ensure compliance with applicable cybersecurity and regulatory requirements, including DFARS, RMF, NIST cybersecurity standards, and organizational security requirements.
• Respond to service and support requests, ensuring work is appropriately prioritized, tracked, documented, and driven to resolution while delivering a high level of customer service.
• Develop and maintain technical and operational documentation, standards, and procedures while mentoring and developing other system administrators through technical leadership, knowledge sharing, cross-training, and hands‑on guidance.
• Work full time onsite within a Department of Defense (DoD) closed area and support occasional planned and unplanned activities outside standard business hours.
• Travel to other U.S. domestic locations may be required, up to 10% annually.
• Obtain applicable DoD certification requirements within six months of the start date.

Skills

Windows

RHEL

Active Directory

Identity management

Patching

Troubleshooting

Virtualization

Storage

Networking

Education

University Degree or equivalent experience

Advanced Degree

Tools

VMware vCenter

vSphere

HPC

Job description

RTX seeks a Sr. Principal System Administrator (Manager, Information Workplace Services) in Tewksbury, MA to lead secure, cost-efficient infrastructure for classified programs.

You will design, implement, and sustain Windows and RHEL environments, collaborating with multiple teams to meet security and operational requirements. Role requires DoD RMF/NIST compliance experience, active Secret clearance, and willingness to work onsite with occasional after-hours support.