Senior Microsoft 365 Administrator

Apex Service Partners; Irving (TX); On-site; USD 120,000 - 150,000; Full time

Benefits offered by this job

Medical, dental, and vision coverage

Competitive PTO and sick leave

Paid holidays

401(k) with company match

Job summary

Apex Service Partners is seeking a Senior Microsoft 365 Administrator responsible for managing its Microsoft 365 environment. This role involves ownership of Entra ID, Intune, Defender, Exchange, SharePoint, and Teams, ensuring optimal performance and security standards.

The ideal candidate should have 8+ years of relevant experience, strong expertise in governance and change management, and a Bachelor’s degree in Information Technology. The position is full-time with a competitive compensation package including benefits like medical coverage and a 401(k) with company match.

Qualifications

• 8+ years of progressive experience administering Microsoft 365 environments.
• Deep expertise in Entra ID, Intune, Microsoft Defender, Exchange Online, SharePoint, and Teams.
• Experience in environments with 5,000+ endpoints and 10,000+ users.

Responsibilities

• Serve as primary owner of the Microsoft 365 tenant and ensure best practices.
• Architect identity services for 12,000 users and manage Intune for 6,000 endpoints.
• Administer Exchange Online, SharePoint Online, and Teams.

Skills

Microsoft 365 Administration

ITIL Change Management

Security Architecture

Education

Bachelor’s degree in Information Technology or related field

Tools

Entra ID

Intune

Microsoft Defender

Exchange Online

SharePoint Online

Teams

Job description

Overview

We do not accept unsolicited resumes or submissions from external recruiting agencies.

Job Description – Senior Microsoft 365 Administrator

Mission of the Role

The Senior Microsoft 365 Administrator will own, secure, and continuously mature Apex Service Partners’ Microsoft 365 environment delivering a scalable, best-practice SaaS foundation that supports rapid growth and acquisition integration. This role is responsible for hands‑on administration and near‑architect level design across Intune (6,000 endpoints), Identity (12,000 users), Defender, Exchange, SharePoint, and Teams, while building durable governance, security controls, and operational standards in an evolving IT control landscape.

Partnering closely with a small internal team and a managed ecosystem of MSP/MSSP vendors, this leader will drive modernization through disciplined ITIL‑based change management, technical mentorship, and practical execution raising security posture, improving reliability, and enabling the business to scale with confidence.

Responsibilities and Experience

Job responsibilities include

Microsoft 365 Platform Ownership

• Serve as primary owner of the Microsoft 365 tenant across Entra ID, Intune, Defender, Exchange, SharePoint, and Teams.
• Design and implement scalable architecture aligned to Microsoft best practices.
• Establish governance standards, configuration baselines, and technical documentation.
• Develop and execute a roadmap that supports rapid growth and acquisition integration.

Identity, Endpoint, and Security

• Architect and manage identity services for approximately 12,000 users, including Conditional Access, MFA, RBAC, and lifecycle governance.
• Own Intune management for approximately 6,000 endpoints, including compliance policies, patching, device configuration, and automation.
• Lead Microsoft Defender configuration and optimization in partnership with the MSSP.
• Improve overall security posture through Zero Trust principles, access controls, and continuous hardening.

Collaboration and Messaging

• Administer and govern Exchange Online, SharePoint Online, and Teams.
• Establish standards for external sharing, retention, data protection, and collaboration governance.
• Improve stability, performance, and user experience across communication platforms.

Operational Governance, Leadership, and Vendor Management

• Operate within an ITIL‑based change management framework and maintain audit‑ready documentation.
• Provide technical leadership and mentorship to a small internal team.
• Serve as senior escalation point for Microsoft 365 engineering issues.
• Direct and manage MSP and MSSP partners to ensure alignment with security, service, and performance expectations.
• Drive operational maturity within a fast‑growing and evolving IT control environment.

Requisite experiences include

• 8+ years of progressive experience administering and engineering Microsoft 365 environments in mid to large scale organizations.
• Deep hands‑on expertise across Entra ID, Intune, Microsoft Defender, Exchange Online, SharePoint Online, and Teams.
• Experience supporting environments with 5,000+ endpoints and 10,000+ users.
• Proven success designing Conditional Access, MFA, RBAC, device compliance, and Zero Trust security architectures.
• Experience operating within an ITIL‑based change management framework and building operational governance.
• Demonstrated ability to lead technical initiatives, mentor small teams, and manage MSP or MSSP partners.

Requirements

• Bachelor’s degree in Information Technology, Computer Science, or related field, or equivalent practical experience.
• Microsoft 365 certification such as Enterprise Administrator Expert, Security Administrator Associate, or Endpoint Administrator Associate.
• 8+ years of hands‑on experience administering and engineering Microsoft 365 environments, including Entra ID, Intune, Defender, Exchange Online, SharePoint, and Teams.

Other

Location: Tampa, FL or Dallas, TX

Job Type: Full-Time Reports To: IT Leadership Compensation: Competitive Benefits: Medical, dental, and vision coverage; competitive PTO and sick leave; paid holidays; 401(k) with company match