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Robert Half Logo Robert Half · IT - Administration

Systems Administrator

United States, Brentwood · Job Posted May 29, 2026
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Job Responsibility

  • Manage Microsoft 365 services across the unified communications environment, ensuring stable performance and consistent user support
  • Provide advanced Tier 2 and Tier 3 troubleshooting for email, collaboration, and content-related incidents, driving issues through to resolution
  • Administer Exchange Online in a cloud-based environment connected to on-premises Active Directory infrastructure
  • Oversee mailbox setup, account changes, deprovisioning activities, and the full lifecycle of user and shared mailbox administration
  • Configure and maintain distribution groups, mailbox permissions, connectors, transport rules, accepted domains, and other mail flow components
  • Investigate delivery problems using message tracing and related diagnostic tools to identify root causes and restore service quickly
  • Carry out approved configuration updates, perform validation testing, and confirm outcomes align with documented technical requirements
  • Develop and maintain runbooks, operational procedures, and support documentation to improve consistency and knowledge sharing
  • Partner with infrastructure and cross-functional teams on messaging-related initiatives, including retention, archiving, and mailbox policy administration
  • Use PowerShell to automate administrative tasks, streamline support activities, and improve operational efficiency

Requirements

  • At least 2 years of experience administering Exchange Online and Microsoft 365 in an enterprise setting
  • Hands-on knowledge of Microsoft 365 services, including messaging, collaboration, and content management administration
  • Experience supporting Exchange Online in a cloud environment integrated with Active Directory
  • Proficiency in PowerShell scripting for automation, reporting, and systems administration tasks
  • Strong understanding of mail flow, including connectors, transport rules, accepted domains, and message troubleshooting
  • Working knowledge of Active Directory, Microsoft Windows Server, and Exchange Online Protection
  • Ability to produce clear technical documentation, standard operating procedures, and support runbooks
  • Demonstrated capability to handle escalated support issues in a Tier 2 or Tier 3 environment

What we offer

  • medical
  • vision
  • dental
  • life and disability insurance
  • 401(k) plan
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