Senior Tier 3 IT Service Desk Lead - On-site DC

trexsolutions; Washington (District of Columbia); On-site; USD 140,000 - 170,000; Full time

Job summary

T-Rex Solutions, LLC is seeking a Tier 3 IT Service Desk Lead to support the Department of Commerce in Washington, DC. The role requires expert troubleshooting, elevated identity management, and extensive M365/Azure administration.

On-site work at the Herbert Hoover building with standard business hours and occasional events or emergencies. Responsibilities include leading complex incidents, automating tasks with PowerShell, and coordinating with engineering and security teams to ensure

Qualifications

• Active Top Secret clearance is required.
• Extensive experience administering Microsoft 365 and Azure services.
• Advanced Active Directory administration and group policy management.
• Proven experience with ITSM modules (Incident, Problem, Change, Knowledge, Request Fulfillment).
• Practical PowerShell scripting ability to automate tasks and integrate systems.

Responsibilities

• Provide expert-level troubleshooting across all support tiers.
• Lead advanced account and identity management with elevated permissions.
• Manage complex M365/Azure and AD administration and ServiceNow configuration.
• Perform deep technical analysis across systems, networks, applications, and infrastructure.
• Coordinate with engineering, cybersecurity, and infra teams to resolve high-impact incidents and drive root-cause analysis.
• Develop and maintain technical procedures, knowledge articles, and troubleshooting guides.

Skills

Top Secret clearance

Microsoft 365 administration

Azure administration

Active Directory administration

PowerShell scripting

ITSM / ITIL processes

Incident/Problem/Change management

Tools

ServiceNow

PowerShell

Job description

T-Rex Solutions, LLC is seeking a Tier 3 IT Service Desk Lead to support the Department of Commerce in Washington, DC. The role requires expert troubleshooting, elevated identity management, and extensive M365/Azure administration.

On-site work at the Herbert Hoover building with standard business hours and occasional events or emergencies. Responsibilities include leading complex incidents, automating tasks with PowerShell, and coordinating with engineering and security teams to ensure