Position Details: Microsoft Defender for O365

Description:

New Requirement

Title-Microsoft Defender for O365

Exp- 5 - 8 Yrs

All Deloitte USI Locations

JD-

1.

We are seeking a Microsoft Defender for Office 365 (MDO) specialist
to support to assess the current-state email and collaboration security
posture of both acquiring and acquired organizations, identifying gaps,
overlaps, and risks across anti-phishing, anti-malware, Safe Links, Safe
Attachments, and anti-spam policies in preparation for tenant-to-tenant
consolidation or coexistence.

2.

This role involves designing the target-state MDO architecture and
policy framework - including threat protection policies, alert
configurations, quarantine management, and reporting - while defining
prerequisites, dependencies, and migration considerations tied to domain
consolidation, mail flow changes, and identity/directory synchronization
during the merger.

3.

The specialist will define pilot scope across representative
mailboxes, domains, and user groups, establish success criteria covering
threat detection efficacy, false-positive rates, and end-user mail
experience, and execute pilot validation to refine policies prior to
broader rollout.

4.

Responsibilities also include leading phased wave-based rollout of
MDO controls across migrated mailboxes and domains, coordinating cutover
activities, stakeholder communications, and change management with M&A
timelines, and providing hypercare support to address mail flow
disruptions, false positives/negatives, and policy tuning while
continuously monitoring threat protection status, incident trends, and
compliance across the consolidated tenant.

Strong hands-on experience with
Microsoft Defender for Office 365, Exchange Online Protection, mail flow,
tenant-to-tenant migrations, and M&A-driven M365 security integration is
required.

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