Domain-Driven Refactoring: A hands-on DDD guide to transforming monoliths into modular systems and microservices

Domain-Driven Refactoring teaches how to apply domain-driven design (DDD) practices to modernize software systems and refactor monoliths into modular architectures or microservices. Written by Alessandro Colla, an eCommerce specialist and DDD expert with 30 years of experience, and Alberto, a backend developer, the book combines actionable insights with practical examples. The book covers key DDD concepts including strategic design with bounded contexts and ubiquitous language, tactical patterns for building aggregates and entities, and modeling techniques to manage complexity. It addresses practical refactoring patterns, microservices integration (including inter-service communication, transaction management, and data strategies), and event-driven architectures for component decoupling. Readers will learn to recognize system component boundaries, apply strategic and tactical patterns, identify pain points in complex codebases, and ensure business logic remains central to software design. The book includes practical examples in C#. Intended for software developers, architects, team leads, and backend engineers modernizing legacy applications, the book provides guidance for transitioning from monoliths to microservices while maintaining architectural integrity. Purchase of the print or Kindle edition includes a free PDF eBook.