Yuhi contributed to the rubocop/rubocop and rails/rails repositories, focusing on backend development and documentation quality. In RuboCop, Yuhi implemented a configurable DefaultToNil option for the Style/FetchEnvVar cop, allowing developers to control environment variable autocorrection behavior in Ruby, which improved flexibility and code safety. For Shopify’s Rails fork and the main Rails repository, Yuhi enhanced documentation accuracy, fixing SQL example typos and clarifying API references for ActiveSupport date calculations. Using Ruby, SQL, and Markdown, Yuhi’s work addressed both code and documentation issues, supporting maintainability and onboarding while demonstrating a thoughtful approach to code analysis and technical writing.