Worked on the flutter/flutter repository to enhance the Stepper widget by introducing customizable header and content padding, allowing designers to adapt layouts without disrupting existing behavior. Focused on UI development and widget customization using Flutter and Dart, the implementation preserved default values for backward compatibility and included comprehensive tests to validate the new properties. Updated both in-code and public documentation to clearly describe usage and integration, ensuring maintainability for future contributors. All changes adhered to Flutter’s CI and style guidelines, with thorough test updates and successful check completions, reflecting a careful, standards-driven approach to open source UI component development.