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Sr Systems Engineer — Microsoft 365

Reign Mark Consulting Services, LLCIrving, TX🇺🇸United StatesPosted 11 Aug 2026

Quick Overview

Work Type
Hybrid
Level
Mid Senior

Job Description

  • Brief Summary of role: This senior individual contributor role owns the engineering, administration, and governance of a global Microsoft 365 environment. Serving as a technical escalation point for core collaboration services, the position blends hands-on platform engineering with project delivery and governance. The successful candidate configures and secures services, automates administration at scale, leads migrations and compliance initiatives, and partners with vendors to maintain a reliable, secure, and audit-ready collaboration ecosystem.
  • Responsibilities:
  • Administer and optimize the Microsoft 365 tenant, covering Exchange Online, Microsoft Teams, SharePoint Online, OneDrive, and Microsoft Entra ID service configuration, health monitoring, and lifecycle management.
  • Manage Microsoft Teams calling, meeting, recording, and retention policies, including automatic call recording (ACR) and Teams Premium rollouts.
  • Provision and govern SharePoint Online sites and OneDrive permissions, public vs. private site classifications, external/guest access, metadata, and storage cleanup.
  • Administer Exchange Online mail flow, distribution/security groups, mailbox lifecycles, message footers/banners, safe-sender lists, and configurations.
  • Manage Microsoft Entra ID app registrations, secret and certificate rotations, conditional access policies, group-based licensing, and guest/inactive account reviews.
  • Develop and maintain PowerShell automation for provisioning, bulk administration, and recurring reporting across the M365 stack.
  • Build and troubleshoot Microsoft Graph API integrations and scope Azure application registrations for internal and partner solutions.
  • Operate workspace governance and reporting tooling (such as SysKit Point) and surface usage insights through Power BI dashboards.
  • Lead and support data migrations into Microsoft 365, including Google Workspace to SharePoint Online and tenant transition initiatives using tools like AvePoint.
  • Administer backup and recovery for M365 workloads using tools like Keepit, perform restores, and support backup-controls assurance reviews.
  • Implement information governance and compliance controls using Microsoft Purview (data retention, legal holds, eDiscovery, information protection) and support regulatory programs like CMMC and SOX.
  • Represent the messaging and collaboration domain in the Change Advisory Board (CAB) and contribute to AI governance for Microsoft Copilot and Copilot Studio.
  • Act as a senior escalation point for complex incidents, partner with vendor support on critical issues, and mentor junior engineers.
  • Skills + Experience Requirements:
  • Bachelor''s degree in Computer Science, Information Technology, a related field, or equivalent professional experience.
  • Minimum of 5 years of hands-on experience administering enterprise Microsoft 365 / Office 365 environments at scale.
  • Deep technical expertise across Exchange Online, Microsoft Teams, SharePoint Online, OneDrive, and Microsoft Entra ID (Azure AD).
  • Strong PowerShell scripting skills for automating administration and reporting across M365 workloads.
  • Working knowledge of Microsoft Graph API and Azure app registration / authentication concepts.
  • Practical experience with conditional access, identity governance, and M365 security and compliance controls.
  • Familiarity with ITSM and change-management processes (such as ServiceNow and CAB).
  • Excellent troubleshooting, documentation, and cross-functional communication skills, with experience supporting a global, multi-region user base (AMER, EMEA, APAC).
  • Preferred: Relevant Microsoft certifications (e.g., MS-102, MS-700, MS-721, SC-300, SC-400, or equivalent).
  • Preferred: Experience with Microsoft Purview, eDiscovery, legal holds, data-retention administration, and compliance frameworks including CMMC and SOX.
  • Preferred: Hands-on experience with M365 migration and backup tooling such as AvePoint and Keepit.
  • Preferred: Experience governing Microsoft Copilot / Copilot Studio and other AI collaboration capabilities.

Skills

Azure
Google Workspace
Power BI
PowerShell
SAFe

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