In this appendix, I will share how my domain-driven design journey started: the story of a start-up company that, for the purposes of this example, we’ll refer to as “Market‐ novus.” At Marketnovus, we had been employing DDD methodology since the day the company was founded. Over the years, not only had we committed every possible DDD mistake, but we also had the opportunity to learn from those mistakes and fix them. I will use this story and the mistakes we made to demonstrate the role that DDD patterns and practices play in the success of a software project.

This case study consists of two parts. In the Part I, I’ll walk you through the stories of five of Marketnovus’s bounded contexts, what design decisions were made, and what the outcomes were. In the second part, I will discuss how these stories reflect the material you learned in this book.

Before we begin, I need to stress that Marketnovus doesn’t exist anymore. As a result, this appendix is in no way promotional. Furthermore, since this is a defunct com‐ pany, I’m free to speak honestly about our experiences.