Sushant Shrestha focused on streamlining theme configuration across the Flutter codebase, working on the flutter/website, flutter/samples, and flutter/flutter repositories. He removed redundant explicit use of the useMaterial3: true setting in Dart and Flutter projects, aligning theme definitions with Material 3 defaults. This approach reduced code duplication and configuration drift, improving maintainability and consistency for Material Design components without altering visual output or functionality. By simplifying theme management, Sushant enabled faster UI iterations and easier updates for design and development teams. His work demonstrated proficiency in Dart, Flutter development, and UI theming, emphasizing code health and future-proofing.