I am a backend engineer who has been working in the mobile gaming space for many years now. Most of the focus today for mobile gaming backends is to scale to millions of players while offering low latency and real-time interactions. Have been following the development of this book through its beta and having read it now, I think it is fair to say that this book is worth its weight in gold. I can relate directly to all the challenges faced over the years in implementing a real time distributed database _like_ functionality with a high read _and_ write throughput, both custom and off the shelf. Extremely well written.