Bernard contributed to the customerio-android and customerio-ios repositories by building cross-platform sticky session support for In-App Messaging, enabling consistent session tracking and analytics across Android and iOS. He implemented sessionId propagation and state management using Kotlin and Swift, updating API endpoints and introducing a SessionManager to associate user interactions with a single session lifecycle. Earlier, Bernard addressed a critical bug in customerio-android, restoring Legacy WebView Messaging Bridge compatibility by ensuring JavaScript messages were correctly routed to the native interface. His work demonstrated depth in Android development, network programming, and state management, focusing on stability and maintainability for legacy and modern clients.