Job Description

Optum is a global organization that delivers care, aided by technology to help millions of people live healthier lives. The work you do with our team will directly improve health outcomes by connecting people with the care, pharmacy benefits, data and resources they need to feel their best. Here, you will find a culture guided by inclusion, talented peers, comprehensive benefits and career development opportunities. Come make an impact on the communities we serve as you help us advance health optimization on a global scale. Join us to start Caring. Connecting. Growing together.

The Senior Microsoft 365 / Exchange Online Engineer provides day-to-day platform engineering and operational ownership across the Microsoft 365 tenants supporting the Enterprise 1099 population. The role supports reliable tenant services, governed change, migration delivery, and alignment with enterprise configuration standards.

This role supports a dedicated engineering function responsible for governing and securing the Microsoft 365 and Entra ID environments for USHealth Group, HealthMarkets, and First Family Insurance. The environment supports roughly 10,000 external 1099 agents. The position will help align tenant operations, identity controls, email protections, telemetry, and change governance with enterprise policies while supporting the HealthMarkets Google Workspace to Microsoft 365 migration.

Primary Responsibilities:

• Engineer and administer Microsoft 365 tenant services with primary ownership for Exchange Online and messaging operations
• Manage mailboxes, recipients, groups, shared resources, accepted domains, transport configuration, and administrative settings
• Plan and execute mailbox onboarding, migration waves, coexistence activities, cutover tasks, and post-migration support
• Support tenant configuration, license assignment processes, service health monitoring, capacity planning, and operational reporting
• Develop and maintain PowerShell automation for repeatable administration, validation, reporting, and bulk operations
• Troubleshoot service incidents, mail delivery issues, client connectivity, permissions, and configuration defects
• Execute changes through approved ServiceNow and enterprise change-management processes
• Coordinate with identity and email security engineers to deliver integrated, secure tenant services
• Support HealthMarkets discovery, Microsoft 365 tenant build, migration, DNS cutover, hypercare, and steady-state transition
• Maintain technical standards, diagrams, inventories, support runbooks, knowledge articles, and audit evidence
• Comply with all applicable Company policies, procedures, and business directives, changes including those relating to work location, team assignments, work schedules, and flexible work arrangements

Required Qualifications:

• Hands-on experience administering Microsoft 365 and Exchange Online in a large or complex environment
• Experience executing migrations and supporting production cutovers and hypercare
• Demonstrated experience with recipient management, transport configuration, migration, mail flow, and service troubleshooting
• Working knowledge of identity dependencies, security controls, DNS, SMTP, and enterprise monitoring
• Proficiency with Exchange Online PowerShell and Microsoft 365 administrative tools
• Proven ability to follow formal incidents, change, problem, and service-management processes
• Demonstrated solid written communication and technical documentation skills

Preferred Qualifications:

• Microsoft 365 Certified: Administrator Expert or current equivalent
• Relevant Exchange Online, messaging, or Microsoft 365 certification
• Experience supporting separate, external-facing, or multi-tenant Microsoft 365 environments
• Experience with Google Workspace to Microsoft 365 migration tooling and methodologies
• Experience using Rally or comparable Kanban/work management tools for project, operational task, and dependency tracking
• Experience supporting globally distributed or offshore operational models
• Familiarity with Microsoft Teams, SharePoint Online, OneDrive, ServiceNow, and Microsoft Graph

Measures of Success

• Microsoft 365 services meet agreed availability, configuration, and operational standards
• Changes, incidents, and service requests are completed through controlled, auditable processes
• Automation reduces manual effort and improves administrative consistency and evidence quality
• HealthMarkets migration milestones are delivered with complete operational readiness and stable transition to support

Key Partnerships

• Partners closely with Global Technology Solutions team for platform alignment and delivery, ESRO for risk and policy oversight, and ICDS leadership for operational governance and service accountability

At UnitedHealth Group, our mission is to help people live healthier lives and make the health system work better for everyone. We believe everyone-of every race, gender, sexuality, age, location and income-deserves the opportunity to live their healthiest life. Today, however, there are still far too many barriers to good health which are disproportionately experienced by people of color, historically marginalized groups and those with lower incomes. We are committed to mitigating our impact on the environment and enabling and delivering equitable care that addresses health disparities and improves health outcomes - an enterprise priority reflected in our mission.