Yuhi contributed to both the rubocop/rubocop and Shopify/rails repositories, focusing on code quality and maintainability. In RuboCop, Yuhi developed a configurable DefaultToNil option for the Style/FetchEnvVar cop, enabling teams to control how environment variables are autocorrected, which improves flexibility in handling ENV values. This feature was implemented using Ruby and required careful code analysis to ensure compatibility with existing workflows. In Shopify/rails, Yuhi addressed documentation accuracy by correcting a SQL example for the with_recursive method, enhancing clarity for developers. The work demonstrated solid skills in Ruby on Rails, SQL, and documentation, with thoughtful attention to detail.