Shawn Zhang contributed to the grafana/tempo repository by delivering three core backend features focused on improving query reliability, data quality, and configuration consistency. Working primarily in Go, Shawn increased the default search result limit and implemented configuration tests to ensure robust query handling. He centralized the logic for exemplar limits across both frontend and backend components, simplifying the API and establishing a single source of truth. Additionally, Shawn enhanced trace data accuracy by deduplicating spans during block creation. His work emphasized thorough testing and refactoring, reducing production risk and supporting scalable performance, demonstrating depth in backend development and testing practices.