Alex Stathis enhanced type inference and linting reliability across Shopify’s Tapioca and RuboCop Sorbet repositories. On Tapioca, Alex improved the DSL’s handling of ActiveRecord’s select with a block, ensuring type generation now returns an array of records rather than a relation, which reduces downstream type errors and manual corrections. For RuboCop Sorbet, Alex refined the autocorrect behavior for SuggestedStrictness on HasSigil and ValidSigil cops, clarifying documentation and aligning linting with recommended strictness strategies. Throughout, Alex applied expertise in Ruby, metaprogramming, and code analysis, delivering targeted, maintainable improvements that streamline developer workflows and increase codebase safety.