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“A Pattern Language: Towns, Buildings, Construction” by Christopher Alexander (1977) is a groundbreaking book in the field of architecture. It introduced the concept of design patterns, which later influenced software development. The “Gang of Four” (Erich Gamma, John Vlissides, Ralph Johnson, and Richard Helm) expanded upon this idea in 1994 in their book Design Patterns: Elements of Reusable Object-Oriented Software. Their work presented 23 design patterns in frontend development to address common challenges in object-oriented programming.

Since the book, many other object-oriented patterns have been discovered. However, the book is considered a cornerstone in software engineering because it established a common vocabulary to describe the solutions and provided a structured and reusable approach.

In this article, we will share some of the design patterns used to transform a legacy codebase into a Domain-Driven Design (DDD) project. Instead of just covering theoretical concepts, we will dive into practical, real-world examples of

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