• As a Principal Engineer on the TiDB Optimizer team, you will be a key technical leader responsible for the architectural vision and execution of our query optimization engine. • Your work will directly impact the performance, reliability, and predictability of one of the most critical components of the TiDB database. • You will tackle deep and complex challenges in query planning, cost-based optimization, and adaptive processing to ensure TiDB remains a world-class distributed SQL database for our global users. • This is a high-impact role that offers the opportunity to shape the future of data infrastructure for thousands of companies.