Worked on foundational improvements in the thingsboard/langchain4j and quarkiverse/quarkus-langchain4j repositories, focusing on code maintainability and reliability. In thingsboard/langchain4j, refactored the Bedrock module by removing Lombok and migrating to standard Java patterns, reducing external dependencies and simplifying builds for future development. In quarkiverse/quarkus-langchain4j, stabilized the default streaming chat model by unifying configuration defaults, replacing deprecated references, and updating documentation to prevent integration errors. Utilized Java, configuration management, and documentation skills to address both feature development and bug fixes, ensuring more predictable builds and a smoother onboarding experience for contributors and developers working with these projects.