Worked on the apache/cassandra repository to improve the reliability and observability of BTI file handling in Cassandra, focusing on backend development and bug fixing using Java. Addressed a critical issue with range queries on early-open BTI files by delivering a robust bug fix and refactored the length override logic to use a clear constant instead of a magic number. Enhanced error handling and logging across key components, broadening exception coverage to improve system resilience. Developed dedicated tests to validate early-open BTI behavior, ensuring better test coverage for edge-case I/O scenarios. Demonstrated strong skills in database systems, testing, and backend engineering.