IT Infrastructure Administrator

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

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.

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)

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

Ensure configurations align with regulatory, contractual, and enterprise security requirements.

Automation & Continuous Improvement

Develop and maintain PowerShell scripts for automation, reporting, and bulk administration.

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

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

Bachelor’s degree in Computer Science, Information Systems, or related field (or equivalent experience)

Experience

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

A proactive engineer who anticipates issues and strengthens security posture.

A collaborative professional who works effectively across IT and security teams.

A technically curious professional who stays current with Microsoft technologies and innovations.

A service-minded problem solver focused on improving employee experience while protecting enterprise systems.

HRU is an Equal Opportunity Employer (EOE).

#HRUProfessional