Worked on backend enhancements for the quarkusio/quarkus and quarkiverse/quarkus-langchain4j repositories, focusing on Java-based REST API design and exception handling. Delivered a feature in RESTEasy Reactive that introduced a strategy attribute to the @UnwrapException annotation, enabling granular control over exception unwrapping based on the presence of parent type exception mappers. This improved the accuracy and reliability of REST error handling. Additionally, addressed robustness in Server-Sent Events processing by implementing guard clauses to ignore null or empty messages, reducing runtime errors in streaming workflows. Emphasized backend development practices to enhance stability and maintainability across both modules.