Senior Microsoft 365 Platform Engineer

Administer environments, connectors, and DLP policies; support solution ALM and pipelines per CoE standards.

Engage Microsoft Premier/Unified Support for technical escalations and proactive services.

Handle Tier 2/3 incidents/problems; manage change control, maintenance windows, and service communications. Engineering & Automation

Maintain audit/compliance reporting; support assessments, investigations, and remediation activities. Power Platform Administration & ALM

The Senior Microsoft 365 Platform Engineer is the operational and engineering core of Suffolk’s Microsoft ecosystem. This role manages tenant‑wide services, implements the Architect’s designs and standards, and drives automation‑first operations. The Engineer ensures reliability, security, and user experience across Exchange Online, Teams, SharePoint/OneDrive, Entra ID, Intune, Defender, and Power Platform, handling Tier 2/3 escalations and leading deployments and changes.

Build and maintain PowerShell and Graph automations for provisioning, reporting, remediation, and license hygiene.

Platform configuration compliance with standards

Provide telemetry and usage insights for capacity planning and license optimization.

Administer, configure, and maintain Microsoft 365 workloads across Exchange Online, Teams, SharePoint Online/OneDrive.

Manage Entra ID objects, Conditional Access, MFA, identity lifecycle, and directory hygiene.

Assist with migrations from legacy file services/SharePoint to SharePoint Online. Service Management & Support Engagement

Implement reference designs and standards defined by the Architect; deliver repeatable, supportable configurations.

Provision Teams/SharePoint sites, implement IA/metadata/search patterns, and support

Enforce DLP, retention, sensitivity labels, Conditional Access, and Defender controls according to policy.

Operate Intune for device onboarding, compliance policies, app packaging/deployment, and security baselines.

Provide enablement to citizen developers within guardrails; review connectors and data access. Collaboration Services Enablement

Lead feature deployments and migrations; coordinate pilots, adoption guides, and rollout plans. Security & Compliance Enablement

Experience in environments with regulatory or contractual compliance requirements.

5+ years administering Microsoft 365 at enterprise scale (≥1,000 users).

Microsoft Certified: Enterprise Administrator Expert and/or Messaging/Teams/Endpoint Administrator.

Experience with Power Platform administration and CI/CD/ALM patterns.

Incident and change resolution timeliness and quality

Clear communicator who collaborates effectively with architects, security, support, and business teams.

While performing the duties of this job, the employee is regularly required to sit for long periods of time; talk or hear; perform fine motor, hand and finger skills in the use of a keyboard, telephone, or writing. The employee is frequently required to stand; walk; and reach with arms and/or hands. Specific vision abilities include close vision, distance vision, depth perception and the ability to adjust focus. The employee will spend their time in an office environment with a quiet to moderate noise level. Job site walking.

Hands‑on executor with strong operational discipline and ownership mindset.

User satisfaction with Microsoft 365 services

Automation coverage and reduction of manual tasks

Continuous learner who tracks Microsoft roadmap changes and adopts best practices.

Practical knowledge of Purview features (retention, DLP, eDiscovery) and security baselines.

Proven delivery of tenant‑wide changes, migrations, and complex incident/problem resolution.

Strong PowerShell and Graph API skills for automation and reporting.

Deep experience with Exchange Online, Teams, SharePoint/OneDrive, Entra ID, Intune, and Defender.

content lifecycle.