Worked on the langchain4j and thingsboard/langchain4j repositories, focusing on backend development and dependency management using Java. Upgraded the OpenAI Java client library to version 2.13.1, which enabled support for the latest API features and improved security. Simplified embedding data processing by converting values from double to float, reducing memory usage and increasing throughput for AI workflows. Addressed a bug to ensure the system message is loaded into memory before processing the first user message, enhancing reliability for initial user interactions. Contributed unit and integration tests, maintaining backward compatibility and reinforcing code quality through clear documentation and adherence to repository standards.