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Tier 3 Microsoft 365 Administrator

iSpace Inc.

Denver, CO

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JOB DETAILS
SKILLS
Administrative Skills, Analysis Skills, Application Integration, Application Programming Interface (API), Architectural Services, Authentication, Automation, Best Practices, Capacity Management, Communication Skills, Corrective Action, Documentation, Ecosystems, Identify Issues, Leadership, Licensing, Loss Prevention, Machine Tool, Maintain Compliance, Mentoring, Microsoft Active Directory, Microsoft Certifications, Microsoft Exchange Server, Microsoft Exchange Server Administration, Microsoft Product Family, Microsoft SharePoint, Microsoft Windows Azure, On Call, Operational Improvement, Operational Strategy, Regulatory Compliance, Regulatory Requirements, Root Cause Analysis, Scripting (Scripting Languages), Security Auditing, Technical Support, Technical Writing, Windows PowerShell, Work From Home
LOCATION
Denver, CO
POSTED
30+ days ago
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: April 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:
  • Administer 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:
  • Act 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
Automation & 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

About the Company

i

iSpace Inc.

iSpace is a global services company focused on Information Technology Staffing, Consulting and Business Process Services. Our solutions and services are centered in four areas - Contracting, Consulting, Outsourcing, and Software Products. Our team of seasoned professionals based in the United States and India focus on providing results, driving innovation and affecting outcomes. Our clients have come to rely on our expertise, our commitment to quality, customer service and our innovative approach to problem solving to help create sustainable value for their customers and shareholders. Specializing in Finance Services, Insurance, Healthcare, Manufacturing, and Entertainment, we work with Fortune 1000 companies throughout the United States. Our commitment to customer satisfaction is reflected in the fact that over 90% of our client base have remained with us for over 9 years. iSpace is committed to quality and information security reflected by the fact that it has been awarded with industry standard certifications such as ISO 9001 and ISO 27001.
COMPANY SIZE
500 to 999 employees
INDUSTRY
Other/Not Classified
FOUNDED
2000
WEBSITE
http://www.ispace.com

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