IT Infrastructure Administrator III
Location: Columbus, OH
Contract: 3 Months (Potential for Extension)
Schedule: Onsite | 1st Shift (Monday–Friday)
Compensation: $51-73/hour + Optional Benefits
Position Overview
Our client is seeking a skilled and security-focused Microsoft 365 Administrator to join their Corporate Information Technology team. This role is responsible for the administration, optimization, and security of a Microsoft 365 environment within a hybrid and multi-tenant enterprise infrastructure.
The ideal candidate brings strong hands-on technical expertise along with a proactive, service-oriented mindset. This individual will manage Microsoft 365 services, support secure identity and access management, collaborate closely with Security teams, and act as a Tier 3 escalation point for complex messaging and collaboration issues.
Key Responsibilities
Microsoft 365 Administration & Operations
- Administer and maintain Microsoft 365 services including:
- Exchange Online
- SharePoint Online
- OneDrive for Business
- Microsoft Teams
- Microsoft Entra ID
- Microsoft Purview
- Copilot Studio
- Power Platform
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Manage hybrid identity and mail flow integrations (Azure AD Connect, Hybrid Exchange).
- Oversee:
- Licensing management
- Mailbox administration
- Distribution and dynamic groups
- Shared resources
- Monitor tenant health, service availability, and usage reporting.
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Provide Tier 3 escalation support for complex issues related to:
- Messaging
- Collaboration
- Authentication
- Directory synchronization
Identity, Security & Compliance
- Manage and maintain:
- Conditional Access policies
- Multi-Factor Authentication (MFA)
- Identity Protection and access governance
- Role-Based Access Control (RBAC)
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Partner with Security Governance and SOC teams to remediate vulnerabilities and support enterprise application reviews.
- Support Microsoft 365 security and compliance capabilities including:
- Microsoft Purview
- Data Loss Prevention (DLP)
- eDiscovery
- Retention and sensitivity labeling
- Microsoft Defender for Office 365
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Ensure configurations align with regulatory, contractual, and enterprise security requirements.
Automation & Continuous Improvement
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Develop and maintain PowerShell scripts for automation, reporting, and bulk administration.
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Leverage Microsoft Graph APIs and other automation tools.
- Identify and implement improvements that increase:
- Reliability
- Efficiency
- Security
- Evaluate new Microsoft features and roadmap updates for enterprise applicability.
Collaboration & Governance
- Partner with:
- Infrastructure teams
- Cloud Engineering
- Service Desk
- Desktop Management
- Security teams
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Support cloud migration and modernization initiatives.
- Contribute to governance models for:
- Microsoft Teams
- SharePoint
- Collaboration platforms
- Maintain documentation, knowledge articles, and change records.
Required Qualifications
Education
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Bachelor’s degree in Computer Science, Information Systems, or related field (or equivalent experience)
Experience
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5+ years of experience administering Microsoft 365 in a mid-to-large enterprise environment
Technical Expertise
Strong experience with:
- Exchange Online
- Microsoft Teams
- SharePoint Online
- OneDrive
- Microsoft Entra ID
Experience with:
- Hybrid identity and directory synchronization (Azure AD Connect)
- Conditional Access policies
- Multi-Factor Authentication (MFA)
- Identity governance
- SMTP mail flow
- SPF, DKIM, and DMARC
Additional requirements:
- PowerShell scripting for automation and administration
- Troubleshooting authentication, SSO, and synchronization issues
- Must be a U.S. Citizen
What We’re Looking For
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A proactive engineer who anticipates issues and strengthens security posture.
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A collaborative professional who works effectively across IT and security teams.
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A technically curious professional who stays current with Microsoft technologies and innovations.
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A service-minded problem solver focused on improving employee experience while protecting enterprise systems.
HRU is an Equal Opportunity Employer (EOE).
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