Worked across StarRocks, Apache Iceberg, and astronomer-cosmos repositories to deliver targeted backend improvements and documentation updates. Enhanced StarRocks by optimizing predicate column vacuuming to skip unnecessary work and by reducing colocate cleanup log noise, streamlining operational reliability. In Apache Iceberg, added VARIANT type support to the RecordConverter, enabling conversion of nested structures and expanding data processing capabilities. Improved astronomer-cosmos documentation by aligning default configuration values with actual implementation, reducing onboarding friction for new users. Leveraged Java, Kafka, and database management skills throughout, with a focus on robust data processing, backend development, and clear, audit-friendly documentation practices.