Shkumbin Delija contributed to the rubocop/rubocop repository by addressing a nuanced bug in the Lint/DuplicateMethods cop, focusing on false positives triggered by anonymous classes defined within blocks. Using Ruby and leveraging expertise in linting and static code analysis, Shkumbin refined the detection logic to accurately distinguish legitimate duplicate methods in block-scoped anonymous classes. This adjustment reduced unnecessary lint warnings, streamlining the feedback loop for developers and enhancing the maintainability of static analysis rules. The work demonstrated careful attention to edge cases in Ruby codebases, resulting in more reliable linting outcomes and supporting ongoing stability in the RuboCop lint suite.