One significant contribution I made to a project using AOSP was the creation of a custom service and the development of additional widgets within the Android settings. This involved several key tasks. I developed a custom service that provided specific functionalities required by the project, which was integrated into the AOSP framework to allow seamless interaction with other system components. I also created new widgets for the Android settings menu, offering users enhanced options and controls tailored to the project's specific needs. Additionally, I worked on upgrading the Android version, modifying the MK files, and managing vendor-specific files to ensure compatibility and stability across different hardware configurations. To guarantee compliance with Android standards, I conducted Compatibility Test Suite (CTS) and Google Test Suite (GTS) verifications, running a series of tests to validate that the customizations met the required specifications without introducing any issues. 

These contributions were crucial in enhancing the functionality and user experience of the project, ensuring that the customizations were robust and compliant with Android standards, and providing a stable and reliable platform for end users.