Senior System Administrator (O365)

Washington, DCPosted Aug 4, 2026

Job description

Senior System Administrator (O365) Employment Type: Onsite/Remote Annexa is seeking a Senior Systems Administrator (O365). This role is responsible for the administration and maintenance of various tools in the Microsoft O365 Suite.

Responsibilities

Responsible for the administration and maintenance of various tools in the Microsoft O365 Suite. Work with both engineering and service desk teams to assist with troubleshooting and updating settings based on customer requirements. Work with O365 team to develop best practices for governance and settings for various tools in the enterprise.

Provide recommendations for optimization and assist with implementation of any improvements identified Configure device quarantine and mandatory enrollment policy for new O365 device activation. Assist with tracking, monitoring and troubleshooting performance levels and capacity. Serve as primary point for escalations for all aforementioned responsibilities.

Telecommuting from anywhere in the U.S. is permitted.

Required Skills

6 years in the job offered or related systems administration role Three years experience in each of the following: Exchange on-prem and Exchange online, including completion of multiple migrations from on-prem mailboxes to Exchange-online AAD connect to sync on-prem accounts to Azure AD Systems administration and management of Exchange Online with Office 365, Powershell V3 or V4 including scripting, Microsoft Teams, SharePoint Online, and OneDrive Implementing and administering SharePoint online and on-prem Configuring third party applications hosted as SAS and appliances with web interface to authenticate against AD and Azure AD Implementing Virtual Machines, Storage, Virtual Switches, VLANs and subnets, load balancers, firewall filtering, DNS, and Content Delivery networks in Azure and AWS Apple configurator and/or Apple School Manager Experience with mobility platforms Airwatch, BES, or GOOD Bachelor's or foreign equivalent in Computer Engineering, Information Technology, Electrical/Electronics Engineering, or closely related field.

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