Explore the challenges and strategies of developing mobile experiences at Facebook's massive scale in this 55-minute conference talk from the Big Android BBQ 2015. Gain insights from Jenny Yuen, Engineering Manager for Facebook's News Feed on Android, as she discusses building high-quality mobile experiences for over 1.49 billion monthly active users. Learn about Facebook's mobile team, the transition to mobile, coding at scale, dependency injection, performance optimization, and identifying common APIs. Discover how Facebook has scaled to support over 10,000 Android devices, implemented support layers, and managed photo uploads and analytics. Delve into topics such as prioritization, testing processes, spatial rollout, experimentation, code reviews, designing for Android, release cycles, open-source tools, and hiring mobile engineers. This talk provides valuable knowledge for developers looking to understand mobile development at a large scale.