Worked on enhancing data-statistics capabilities in the cmu-db/optd repository by implementing column-level statistics support within the DataFusion connector, refactoring core statistics types for broader reuse, and extending the Catalog API to improve query optimization and data accuracy. Leveraged Rust and C++ to align statistics sharing across crates, enabling more maintainable and scalable analytics features. In the cmu-db/bustub repository, developed comprehensive unit tests for the ARC Replacer’s remove function, verifying correct eviction and frame-removal behavior to reduce regression risk. Focused on backend development, data processing, and memory management, the work emphasized robust test coverage and maintainable code structure.