Worked on the aws-amplify/amplify-flutter repository to enhance Android runtime compatibility for Amplify Push Notifications. Addressed a critical runtime error by refactoring code to replace the removeFirst() method with removeAt(0), ensuring support for Android versions below 11 and enabling a minimum SDK of 21. This change preserved existing behavior while broadening device compatibility and reducing the risk of crashes due to NoSuchMethodError. Demonstrated careful attention to backward compatibility and stability, documenting the rationale clearly in the commit. Utilized Kotlin and Android development skills to deliver a targeted bug fix that improved reliability for a wider range of devices.