Riot Games' Julius Skripkauskas and Nextdoor's Walt Leung discuss building better mobile experiences, focusing on choosing the right technology, tracking key performance indicators (KPIs), and staying up-to-date with trends in device formats and AI. They share their experiences with cross-platform frameworks like React Native and Flutter, as well as declarative UI frameworks such as Jetpack Compose and SwiftUI. The duo emphasizes the importance of measuring mobile app performance using tools like Sentry to ensure a high-quality user experience, particularly for large-scale apps with millions of users. Additionally, they touch on the future of devices in mobile development, including larger screens, foldable devices, and wearable technology, and how AI can be used in mobile app development, such as with ChatGPT and GitHub co-pilot.