Worked on the firebase/quickstart-ios repository to enhance notification user experience consistency across iOS versions by consolidating notification presentation logic in both Swift and Objective-C. Developed robust handling for iOS 14 and above, supporting new presentation options while maintaining legacy behaviors for older systems. Focused on cross-language alignment by synchronizing changes in AppDelegate.swift and AppDelegate.m, ensuring consistent functionality regardless of implementation language. Improved codebase hygiene by removing trailing whitespace to aid readability without altering application behavior. Leveraged mobile development and iOS development expertise, applying knowledge of Swift and Objective-C to deliver maintainable, version-compatible solutions that address stability and correctness in messaging.