Over a two-month period, contributed to the apache/inlong repository by delivering four features and resolving a critical bug, focusing on backend stability, performance, and security. Work included optimizing Pulsar message retrieval through concurrent programming with Java and Spring Framework, enhancing CI build reliability by implementing idempotent swapfile setup in Docker-based pipelines, and tightening deletion permissions for InlongGroup entities to ensure secure operations. Additionally, improved audit query reliability by refining nodeType mapping and preventing null audit IDs, strengthening data quality for governance. Emphasized robust unit testing and CI/CD practices throughout, demonstrating depth in backend development and RESTful API design.