No matter how much the world of computing changes, system design remains crucial. While most people try to learn it through quick tutorials or AI-generated summaries, there is no better way to master the field than by studying the original research papers. This book serves as a roadmap through those foundational texts, covering seminal papers in distributed systems, operating systems, and big data. It doesn't just look at what these systems do; it digs deep into why they were built that way. Built from years of notes taken during discussions at top universities and industry meetups, this guide helps readers understand how systems work under the hood. It is for those who are tired of surface-level content and want to develop the technical patience to wrestle with complex problem-solving. Readers will find the journey long and challenging but highly rewarding, as it enables them to elevate their engineering craft to a truly professional level.