Worked on the JabRef/jabref repository to enhance the reliability of automatic grouping features by addressing a correctness issue in the Groups badge counting mechanism. Applied object-oriented programming principles in Java to introduce a hierarchical, context-based method for evaluating group membership, which improved the accuracy of reference organization. Expanded unit test coverage to safeguard against regressions and edge cases, ensuring that grouping logic remains robust and maintainable. The work focused on refining the underlying algorithms for group evaluation, resulting in more dependable user-facing grouping behavior and increased trust in the system’s ability to organize references accurately and consistently over time.