Worked on the EssentialsX/Essentials repository, focusing on backend reliability and API compatibility over a two-month period. Addressed message formatting issues by updating TranslatableException to return legacy text, ensuring consistent output for API consumers using Adventure-format messages. Improved server stability by resolving a NullPointerException in getPlayerLocale, adding defensive checks and fallback logic for offline players. Collaborated effectively within the pull request workflow, contributing concise commit messages and co-authoring fixes. Leveraged Java for backend and API development, with particular attention to exception handling and robust error management. The work emphasized maintainability and compatibility, directly reducing runtime errors and improving user experience.