Worked on cross-repository improvements for a2aproject/a2a-samples and google/A2A, focusing on backend development and code refactoring using Python. Delivered a reusable Task Manager by introducing an abstract base class, AgentWithTaskManager, enabling logic reuse across Google ADK samples. Enhanced JSON Schema handling by removing null support and updating model serialization to exclude None values, which streamlined data processing and improved schema validation. Updated test execution instructions and documentation to clarify workflows and reduce test flakiness. These efforts increased maintainability, consistency, and onboarding speed for new integrations, leveraging skills in API development, object-oriented design, and software engineering best practices.