During January 2026, Alex Frase focused on backend development for the rubocop/rubocop repository, addressing a nuanced issue in the RuboCop linter’s exclusion logic. Alex revised the system so that configuration-based exclusions reliably take precedence over in-source opt-in comments, ensuring that excluded files are not inadvertently linted. This work involved updating the Ruby codebase, refining the logic for exclusion precedence, and expanding the test suite to prevent future regressions. Additionally, Alex updated documentation to clarify the new behavior for users. The solution improved linting predictability and consistency, leveraging skills in Ruby on Rails, backend engineering, and automated testing.