Worked on the customerio-android and customerio-ios repositories to deliver cross-platform sticky session support for in-app messaging, enabling consistent session attribution and analytics across Android and iOS. Implemented sessionId propagation, state management, and updated API endpoints using Kotlin and Swift, ensuring user interactions are accurately associated with a single session lifecycle. Addressed a critical bug in the Android client by restoring Legacy WebView Messaging Bridge compatibility, which involved targeted debugging and JavaScript integration to maintain reliable JS-to-native communication on legacy rendering mechanisms. The work focused on robust API integration, network programming, and state management to improve stability and maintainability.