Worked on the langchain4j/langchain4j repository to enhance the reliability of concurrent workflows by addressing a critical issue in retry utilities. Focused on improving thread interruption handling, the developer implemented a fix that ensures interrupted threads during retry operations correctly throw exceptions, thereby maintaining proper thread state. This solution was developed in Java and involved both unit and integration testing to validate behavior across core modules. By increasing test coverage for various retry scenarios and confirming stability through comprehensive test suites, the work contributed to safer retry semantics and reduced operational risk for user integrations without introducing breaking changes.