M365 Support Senior Consultant

M365 Support Senior Consultant   Location: Katowice - 2 days in office / 3 days remote   Let us introduce you the job offer by EY GDS Poland – a member of the global integrated service delivery center network by EY.   The opportunity   We are looking for a Senior M365 & Power Platform Engineer who serves as the expert escalation point for complex issues, platform architecture, governance, and automation. You will drive deep diagnostics, implement enterprise‑level configurations, lead service improvements, and provide expert‑level Power Platform support across environment governance, Dataverse, performance, and complex flow failures.  In addition to standard business hours, the consultant will participate in an on-call support rotation. On-call duties may occasionally include evenings, nights, weekends. During these periods, the consultant is expected to remain available to respond to potential system-related incidents or user requests and, when required, take ownership of troubleshooting and resolving issues.   Your key responsibilities

Responsible for decision-making, optimizing processes, resource management, and overseeing team management as needed for task execution. Accountable for allocating personnel, supervising team members, assigning tasks, ensuring that the team has the necessary tools and support to succeed in their roles and optimizing and evaluating their performance to meet organizational goals. As part of the project requirements, the Consultant will provide support during regular business hours and participate in a pre-scheduled on-call rotation. During on-call periods, the Consultant will be expected to remain available to respond to system incidents and user requests when necessary.

Lead complex RCA and deliver permanent fixes across Exchange, SharePoint, OneDrive, and Teams. Design and enforce governance, compliance, and security frameworks aligned to enterprise standards. Build advanced PowerShell automation for large‑scale admin, reporting, and operations. Own Conditional Access, DLP, retention, sensitivity labels, and tenant‑wide security/compliance policies. Implement platform enhancements across Exchange, SharePoint, and Teams. Partner with architects/service owners on solution design and platform decisions. Mentor L1/L2 teams; uplift capability through documentation and knowledge sharing.

Resolve advanced Power Automate issues (custom connectors, throttling, complex dependencies). Diagnose Dataverse role conflicts, schema issues, capacity constraints, and environment blockers. Optimize Power Apps for performance, security, and governance. Support CoE initiatives, DLP policies, and ALM/solution lifecycle processes. Provide guidance on environment strategy and data design. Implement automation/monitoring to improve reliability and visibility.

Skills and attributes for success

Deep knowledge of Microsoft 365 architecture & integrations, enabling expert cross‑service troubleshooting. Expert administration of Exchange Online, SharePoint Online, OneDrive, Teams, and Purview (Security & Compliance). Strong Power Platform expertise — Power Apps, Power Automate, and Dataverse, including cross‑service troubleshooting and governance awareness. Advanced PowerShell & Microsoft Graph automation for reporting, governance, and large‑scale administration. Strong Entra ID (Azure AD): Conditional Access, MFA, identity governance, authentication flows, and hybrid concepts. Proven RCA leadership, stakeholder management, and clear executive‑level communication. Proficient with audit/sign‑in logs, Message Trace, CQD/Call Analytics, and health/performance diagnostics. Coaching mindset — able to mentor L1/L2 teams and drive process and operational excellence. Hands-on approach to collaborating with R&D teams to identify and implement best practices and new MS DYNAMICS 365 solutions that may enforce