Don't have a CS degree? So is Rob. That's why he wrote this book: to fill the gaps in his career. Conclusion? More than 450 pages of essential skills and ideas every developer should know, with illustrations by the author who loves to sketch. An illustrated CS Primer if you want. Rob is a self-taught software developer (like many others) and has learned what it takes to get the done for most of his career. When the conversations turned to the core concepts, he disconnected. Rob decided to change all that in 2014. He sat down and looked at all the topics a typical CS degree covers, and then he dived in. Halfway through, he decided to write a book about what he had learned. This book is The Imposter's Handbook, a compendium of useful programming concepts from Algorithms to Complexity Theory, from TDD to Garbage Collection. Here's what you really need to know if you're getting paid to write software.