Worked on the univelop/yust and univelop/yust_ui repositories to standardize cross-platform data access and improve maintainability in Dart and Flutter applications. Developed a unified YustDatabaseService API with startAfterDocumentName pagination, enabling scalable document retrieval and consistent interfaces across platforms. Enhanced authentication reliability by refactoring YustAuthService to always fetch user data from the database, reducing stale cache issues. Improved the YustFilter API with factory constructors and clearer comparator grouping for more readable filter creation. Refactored the YustSwitch UI component to use a dynamic builder, simplifying rendering logic. Focused on API design, backend development, and UI development throughout the process.