TS/SCI Systems Administrator (Linux & Windows)

Systemstechnologyresearch; Arlington (VA); On-site; USD 105,000 - 125,000; Full time

Job summary

STR seeks a Systems Administrator to support Linux and Windows environments in a mission-critical defense research setting. The position requires active Top Secret/SCI clearance and is based in Arlington, VA, with no remote work.

You will work with senior admins, ISSOs, and researchers to deploy, maintain, and secure IT infrastructure, including virtualization, AD, and policy enforcement. The role emphasizes reliability, security, and day-to-day operations in a tightly controlled environment.

Qualifications

• Active Top Secret/SCI clearance required.
• Experience administering Linux (Red Hat/Ubuntu) and Windows.
• Ability to implement, deploy, and maintain secure, virtualized environments.
• Willingness to work Arlington, VA on-site.

Responsibilities

• Support senior admins, ISSO, management, researchers and others supporting the customers.
• Configure and maintain NAS Storage, Networking, Firewall, and Directory Services such as MS Active Directory management and Group Policy administration.
• Perform performance monitoring, results analysis and enhancement, as well as process automation using PowerShell scripting and other available technologies.
• Provide daily support, systems maintenance, problem resolution, tracing and project support.
• Create and maintain installation and configuration SOPs.
• Maintain current knowledge of DoD security and technical guidelines and the organization's policies.
• Provide support for production and development environments.
• After-hours support is required for maintenance and patching when needed.

Skills

Linux Administration

Windows OS Administration

Education

Bachelor's degree

Master's degree

PhD

Tools

PowerShell

Active Directory

Group Policy

Job description

STR seeks a Systems Administrator to support Linux and Windows environments in a mission-critical defense research setting. The position requires active Top Secret/SCI clearance and is based in Arlington, VA, with no remote work.

You will work with senior admins, ISSOs, and researchers to deploy, maintain, and secure IT infrastructure, including virtualization, AD, and policy enforcement. The role emphasizes reliability, security, and day-to-day operations in a tightly controlled environment.