Tier 3 M365 Admin
Job Description
Job Title: Tier 3 Microsoft 365 Engineer
Duration: 9+ Month Contract (with possibility for extension or conversion)
Location: Denver, CO or Brentwood, TN
Work Schedule: Hybrid – Must be onsite 3 days per month (Tuesday, Wednesday, Thursday of the 2nd full week each month)
Job Summary
We are seeking a highly skilled Tier 3 Microsoft 365 Engineer to provide advanced technical support, administration, and engineering for our Microsoft 365 environment.
This role serves as the highest-level escalation point for complex issues, leads platform optimization efforts, and partners closely with security, identity, and infrastructure teams to ensure a secure, scalable, and reliable M365 ecosystem.
Key Responsibilities Microsoft 365 Administration & Engineering
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Administer and optimize Microsoft 365 services with deep hands-on ownership of:
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SharePoint Admin Center (Online sites, permissions, governance, storage, sharing)
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Exchange Admin Center (Online mailboxes, transport rules, retention, hybrid configurations)
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Teams Admin Center (Policies, voice, meetings, apps, and integrations)
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Design, implement, and maintain M365 configurations aligned with organizational standards and best practices
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Manage tenant-wide settings, service health, licensing, and capacity planning
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Act as the highest-level escalation point for complex M365 incidents and service degradation
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Perform root cause analysis (RCA) and implement long-term corrective actions
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Engage Microsoft Premier/Unified Support as needed and manage cases through resolution
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Partner with security teams to implement and maintain:
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Conditional Access policies
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Data Loss Prevention (DLP)
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Retention and eDiscovery policies
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Ensure compliance with organizational and regulatory requirements
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Support audits and security reviews related to M365 services
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Develop and maintain automation using PowerShell, Microsoft Graph, and M365 APIs
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Improve operational efficiency through scripting, standardization, and self-service tooling
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Evaluate and deploy new M365 features and capabilities
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Mentor Tier 1 and Tier 2 support staff
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Create and maintain technical documentation, runbooks, and standards
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Provide architectural input for M365-related projects and migrations
Required Qualifications
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5+ years of experience administering Microsoft 365 in an enterprise environment
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Expert-level experience with:
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SharePoint Online and SharePoint Admin Center
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Exchange Online and Exchange Admin Center
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Microsoft Teams and Teams Admin Center
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Strong PowerShell scripting skills for M365 administration
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Solid understanding of Azure AD / Entra ID (identity, authentication, and access management)
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Experience troubleshooting hybrid environments (on-prem AD, Exchange hybrid)
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Strong analytical, documentation, and communication skills
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Must be local to Denver, CO or Brentwood, TN and able to meet onsite requirements
Preferred Qualifications
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Microsoft certifications (e.g., MS-102, Exchange, Teams, or Security certifications)
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Experience with Microsoft Purview, Defender for Office 365, and Intune
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Familiarity with large-scale migrations to Microsoft 365
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Experience working in regulated or highly secure environments
Working Conditions
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Participation in an on-call rotation for critical incidents may be required
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Hybrid work model with defined onsite expectations
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