React Native production lessons from React Universe Meetup x Zalando

Four production lessons from React Universe Meetup x Zalando covering React Native in real-world scenarios: measuring perceived performance during brownfield migrations using a 'Meaningful Render' metric, optimizing video feeds by sequencing scroll stability before autoplay improvements, using React Native as a pragmatic bridge when web apps need native API access (e.g., HealthKit), and running on-device LLMs with attention to hardware variation and runtime selection. The overarching theme is that React Native production challenges live at the edges — native handoffs, resource management, API boundaries, and device-specific runtime behavior.