Principal Software Engineer
Summary
Principal Software Engineer at Microsoft 365 Core builds and maintains the high-availability backend data platform powering Copilot and other services, focusing on database engines and global failover systems.
Overview High Availability (HA) is one of the foundational engineering teams in Microsoft 365 Core, owning backend data platform that powers Copilot and storing exabytes of customer sharded data across a globally distributed fleet. We build and own technology that deliver 99.995% availability, enable sub-5-second cross-regional failovers, and safeguard exabytes of customer data. Our team owns database engine (Extensible Storage Engine - ESE), failover cluster, and asynchronous active-passive re…