Tier 3 Microsoft 365 Administrator

Tier 3 Microsoft 365 Administrator

Location: Denver, CO or Brentwood, TN

This is a hybrid of remote work along with 3 days/month onsite the 2 nd full week of each month on Tuesday, Weds, and Thursday and perhaps a few more days as needed based on business needs

Duration: pril 2026 - December 31, 2026 with possibility of an extension

On Call Support: May require participation in on-call rotation for critical incidents


We are seeking a highly skilled Tier 3 Microsoft 365 Administrator to provide advanced technical support, administration, and engineering for our client's Microsoft 365 environment. This role serves as the 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.


Responsibilities will include the following:

Microsoft 365 Administration & Engineering:

• dminister and optimize Microsoft 365 services, with deep hands-on ownership of:
  • SharePoint Admin Center (Online sites, permissions, governance, storage, sharing)
  • Exchange Admin Center (Online mailboxes, transport rules, retention, hybrid configurations)
  • Teams Admin Center (Policies, voice, meetings, apps, and integrations)
• Design, implement, and maintain M365 configurations aligned with organizational standards and best practices
• Manage tenant-wide settings, service health, licensing, and capacity planning

Tier 3 Support & Escalation:

• ct as the highest-level escalation point for complex M365 incidents and service degradation
• Perform root cause analysis (RCA) and implement long-term corrective actions
• Engage Microsoft Premier/Unified Support as needed and manage cases to resolution

Security, Compliance & Governance:

• Partner with security teams to implement and maintain:
  • Conditional Access policies
  • Data Loss Prevention (DLP)
  • Retention and eDiscovery policies
• Ensure compliance with organizational and regulatory requirements
• Support audits and security reviews related to M365 services

utomation & Optimization:

• Develop and maintain automation using PowerShell , Microsoft Graph, and M365 APIs
• Improve operational efficiency through scripting, standardization, and self-service tooling
• Evaluate and deploy new M365 features and capabilities

Collaboration & Leadership:

• Mentor Tier 1 and Tier 2 support staff
• Create and maintain technical documentation, runbooks, and standards
• Provide architectural input for M365-related projects and migrations

Required Skills and Expertise:

• 5+ years of experience administering Microsoft 365 in an enterprise environment
• Expert-level experience with the following:
  • SharePoint Online and SharePoint Admin Center
  • Exchange Online and Exchange Admin Center
  • Microsoft Teams and Teams Admin Center
• Strong PowerShell scripting skills for M365 administration
• Solid understanding of Azure AD / Entra ID (identity, authentication, and access management)
• Experience troubleshooting hybrid environments (on-prem AD, Exchange hybrid)
• Strong analytical, documentation, and communication skills

Desired Skills and Expertise:

• Microsoft certifications (e.g., MS-102 , Exchange , Teams , or Security certifications)
• Experience with Microsoft Purview, Defender for Office 365, and Intune
• Familiarity with large-scale migrations to M365
• Experience in regulated or highly secure environments