This Level 5 Software Development Engineer role on the App Experiences (AppX) team. The position, located at SFO13 in San Francisco, CA under Amazon.com Services LLC, focused on building mobile shopping innovations for the Amazon Shopping App; one of Amazon's fastest-growing businesses serving hundreds of millions of users. The role required architecting end-to-end customer experiences for iOS and Android, optimizing client and server systems for performance and scalability, and mentoring team members toward engineering excellence. Candidates needed 5+ years of software development experience (3+ in multi-threaded mobile apps), expert knowledge of Java/Android or Objective-C/Swift, and a BS/MS in Computer Science.