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At this point, nearly every developer is a developer or consumer (or both) of distributed systems. Even relatively simple mobile applications are backed with cloud APIs so that their data can be present on whatever device the customer happens to be using. Whether you are new to developing distributed systems or an expert with scars on your hands to prove it, the patterns and components described in this book can transform your development of distributed systems from art to science. Reusable components and patterns for distributed systems will enable you to focus on the core details of your application. This book will help any developer become better, faster, and more efficient at building distributed systems. Throughout my career as a developer of a variety of software systems, from web search to the cloud, I have built a large number of scalable, reliable distributed systems. Each of these systems was, by and large, built from scratch. In general, this is true of all distributed applications. Despite having many of the same concepts and even at times nearly identical logic, the ability to apply patterns or reuse components is often very, very challenging. This forced me to waste time reimplementing systems, and each system ended up less polished than it might have otherwise been. The recent introduction of containers and container orchestrators fundamentally changed the landscape of distributed system development. Suddenly we have an object and interface for expressing core distributed system patterns and building reusable containerized components. I wrote this book to bring together all of the practitioners of distributed systems, giving us a shared language and common standard library so that we can all build better systems more quickly. Once upon a time, people wrote programs that ran on one machine and were also accessed from that machine. The world has changed. Now, nearly every application is a distributed system running on multiple machines and accessed by multiple users from all over the world. Despite their prevalence, the design and development of these systems is often a black art practiced by a select group of wizards. But as with everything in technology, the world of distributed systems is advancing, regularizing, and abstracting. In this book I capture a collection of repeatable, generic patterns that can make the development of reliable distributed systems more approachable and efficient. The adoption of patterns and reusable components frees developers from reimplementing the same systems over and over again. This time is then freed to focus on building the core application itself.