Contributed to both the swiftlang/swift-syntax and p0deje/Maccy repositories over a two-month period, focusing on usability and developer experience. Developed a convenience initializer for SubscriptDeclSyntax in SwiftSyntax, leveraging Swift and syntax tree manipulation to streamline subscript declaration construction and reduce boilerplate, accompanied by comprehensive unit tests to ensure reliability. In the Maccy Clipboard Manager, implemented an image dimensions preview feature using Swift and UI design principles, enabling users to view image width and height directly within clipboard previews. These enhancements improved workflow efficiency and user context, reflecting a thoughtful approach to both API ergonomics and end-user experience.