Developed and delivered the A2UI Schema System within the androidx/androidx repository, introducing A2uiSchema classes to define structured schemas for A2UI components. This schema-driven approach enabled consistent UI definitions, robust validation, and safer refactoring across UI modules. Leveraging Kotlin for implementation and Gradle for test automation, the work included comprehensive unit testing through A2uiSchemaTest to ensure reliability. By establishing reusable schema components and modular architecture, the project laid a foundation for scalable and maintainable UI configurations. The focus on schema design and test coverage addressed the need for reliable UI changes, reducing risk and accelerating future development within the codebase.