Microsoft's Azure Data engineering team is seeking a Principal Software Engineer to join their CosmosDB for MongoDB / PostgreSQL team. This role is part of Microsoft's mission to build the data platform for the age of AI, working on products like Microsoft Fabric, Azure SQL DB, Azure Cosmos DB, and more. The position involves working with a geographically distributed team developing features for query engines, index structures, and storage layouts. The ideal candidate will have extensive experience in systems design/databases and will work on critical features while engaging with the open-source community. The role offers the opportunity to work on large-scale distributed systems, contribute to database internals, and mentor team members. Microsoft values diversity and different perspectives, offering comprehensive benefits and a collaborative environment. The position requires strong technical expertise in database systems, distributed computing, and system-level programming, with opportunities to shape the future of cloud-based data solutions.