Hybrid TS/SCI Senior SysAdmin

Dunhill Professional Search & Government Solutions; Arlington (VA); Hybrid; USD 120,000 - 180,000; Full time

Job summary

Dunhill Professional Search & Government Solutions in Arlington, VA is seeking a Senior System Administrator to lead the administration, security, and resilience of enterprise IT infrastructure in a federal, hybrid environment. The role requires hands-on expertise across Windows, Linux, virtualization, cloud, and on-site/on-call support. Candidates must hold a TS/SCI clearance and U.S.

citizenship. You will design recovery plans, develop automation, mentor staff, and coordinate incident response

Qualifications

• Bachelor’s degree in IT/CS or equivalent experience.
• 7–10 years of enterprise systems admin experience.
• Experience with Windows, Linux, and cloud environments.
• Expertise in backup, patch management, and config management.
• Scripting in PowerShell, Bash, or Python for automation.
• Current TS/SCI clearance and U.S. citizenship.

Responsibilities

• Engineer and maintain Windows, Linux, cloud and hybrid server environments.
• Lead troubleshooting of failures and performance issues to restore service.
• Design backup, DR, and continuity procedures for critical infrastructure.
• Maintain secure baselines, patching strategies, and access controls.
• Develop automation for provisioning, monitoring, and configuration management.
• Analyze logs and capacity trends to optimize performance.
• Lead incident response and coordinate across teams.
• Review changes for security and recoverability; provide guidance.
• Mentor junior admins and support on-call escalations.

Skills

Windows Server

Linux

Virtualization

Cloud (AWS/Azure)

Automation (PowerShell/Bash/Python)

Security/compliance

Disaster Recovery

On-call support

Scripting

Root cause analysis

Education

Bachelor’s degree in IT/CS or equivalent experience

Tools

PowerShell

Bash

Python

VMware

AWS

Azure

Windows Server

Job description

Dunhill Professional Search & Government Solutions in Arlington, VA is seeking a Senior System Administrator to lead the administration, security, and resilience of enterprise IT infrastructure in a federal, hybrid environment. The role requires hands-on expertise across Windows, Linux, virtualization, cloud, and on-site/on-call support. Candidates must hold a TS/SCI clearance and U.S.

citizenship. You will design recovery plans, develop automation, mentor staff, and coordinate incident response