Legacy code projects struggle before coding even begins. Which features are implemented, where they are located, and at what maturity level, is often unclear. In short, a gap exists between the business domain and what is implemented in code.

In green-field projects we use Domain-Driven Design tools and patterns so the gap does not happen. An additional set of patterns is needed when we start out with legacy code though.

In this talk we'll explore the core patterns to rediscover the domain. These patterns go beyond merely deciphering the code's functionality. They provide strategies to comprehend the underlying concepts, behaviors, and relationships in the domain.