Lead the engineering design, implementation, and lifecycle of the enterprise endpoint infrastructure: hardened image pipelines, automated provisioning, endpoint management platform architecture (MECM/SCCM, Intune), configuration baselines, and VDI integration across all enclaves. When Tier I and Tier II cannot resolve an issue, this engineer performs deep diagnostic analysis of operating system, application, Group Policy, MECM client, encryption, VDI, and endpoint security behavior to identify root cause, engineers permanent fixes, and liaises with Microsoft and OEM vendors at Tier IV.