Liwen Deng contributed to the Eventual-Inc/Daft repository by developing concurrency safeguards for AzureBlobSource, introducing a connection pool semaphore and configurable IO thread limits to prevent resource exhaustion during large-scale parquet file processing. Using Rust and Python, Liwen enhanced SQL query planning by adding checks to prevent duplicate CTE names, improving correctness and reliability. The work also included extending glob pattern support with bash-style numeric ranges and implementing safety limits for expansion. Additionally, Liwen upgraded the PyArrow dependency to version 15.0.0, streamlining compatibility and leveraging new features. These changes collectively improved backend stability, performance, and developer productivity through robust engineering practices.