In this podcast episode, Pavan Adharapurapu, a tech lead at Google, discusses the challenges of executing client-transparent backend migrations across various Google services while keeping millions of users unaffected. He highlights the importance of client transparency, addressing compatible responses and state changes, as well as the need to manage undocumented features and bugs that could impact user experience. Pavan shares practical strategies for successful migrations, such as thorough testing and gradual rollouts, and emphasizes the necessity of prioritizing user needs and maintaining open communication throughout the process.