Worked on the JabRef/jabref repository to address a user interface issue affecting group management features. Focused on Java-based GUI development and refactoring, the developer resolved a bug where the Group Tree failed to refresh after group removals, edits, or renames. By ensuring the UI state remained synchronized with the underlying data model, this fix improved both the accuracy and responsiveness of group-related actions. The solution was linked to project planning through clear commit references and issue tracking, demonstrating attention to maintainability and traceability. This work contributed to a more reliable and user-friendly experience for JabRef users.