Senior Microsoft 365 Administrator

Job Title: Senior Microsoft 365 Administrator

Location: Herndon, VA (Hybrid - 3 days onsite)

Duration: Long Term Contract)

Work Authorization: US Citizens only (Clearable)

Interview: Final Onsite

Job Overview


We are seeking a Senior Microsoft 365 Administrator to serve as the technical lead and subject matter expert for managing, optimizing, and modernizing the Microsoft 365 environment. The ideal candidate will have deep enterprise-level expertise, proven experience driving large-scale M365 initiatives, and a strong background in collaboration, security, and compliance. This forward-thinking role will directly support modernization projects, tenant optimization, and end-user adoption while ensuring secure and scalable cloud collaboration solutions.

Key Responsibilities

• Lead and drive Microsoft 365 upgrades, migrations, and modernization initiatives .
• Architect, configure, and maintain Exchange Online, SharePoint Online, Teams, OneDrive, and M365 Admin Center .
• Implement best practices for identity, access management, security, and compliance including Conditional Access, Sensitivity Labels, DLP, and Defender for O365.
• Manage tenant-level configurations , hybrid integrations, and licensing strategies.
• Proactively monitor system health, usage metrics, and compliance dashboards using PowerShell, Graph API, and Microsoft Security & Compliance Center.
• Develop and enforce governance standards, documentation, and disaster recovery procedures .
• Collaborate cross-functionally with IT, Security, and business stakeholders to deliver strategic initiatives.
• Mentor junior team members and act as technical escalation point for complex issues.
• Evaluate emerging Microsoft 365 technologies and recommend adoption strategies.
• Provide end-user training and guidance to drive adoption and maximize business value.

Required Qualifications

• Bachelor's degree in Computer Science, MIS, or related field (or equivalent professional experience).
• 7+ years of hands-on administration/engineering experience with Microsoft 365 in enterprise environments.
• Proven success in M365 implementations, upgrades, and enterprise-level projects .
• Strong expertise in Exchange Online, SharePoint, Teams, OneDrive, and Azure AD .
• Advanced experience with the Power Platform (Power BI, Power Apps, Power Automate) .
• Strong PowerShell scripting skills and Graph API experience.
• Expertise in security and compliance configurations (Defender for O365, Conditional Access, DLP, Sensitivity Labels).
• Knowledge of hybrid Active Directory and legacy system integrations.
• Microsoft Certifications (MS-100, MS-101, SC-300, or equivalent).
• Excellent communication, documentation, and stakeholder management skills.

Preferred Qualifications

• SharePoint 2013+ administration and customization.
• Security auditing, tenant hardening, and compliance configuration.
• Experience with Defender for O365 and Microsoft Security & Compliance Center.
• Knowledge of networking fundamentals, HTML, JavaScript, and SQL Server .

Certifications (Preferred but not mandatory)

• Microsoft 365 Certified: Enterprise Administrator Expert (MS-100/102)
• Microsoft 365 Certified: Mobility and Security (MS-101/102)
• Microsoft Certified: Identity and Access Administrator Associate (SC-300)
• Microsoft Certified: Cybersecurity Architect Expert (SC-100)
• Microsoft Certified: Security Operations Analyst Associate (SC-200)