To prepare legacy software for the future, it’s essential to modernize it. Domain-Driven Transformation provides an effective approach for transforming large legacy systems—either by breaking them into microservices or by converting them into maintainable modular monoliths.
In this book, Carola Lilienthal and Henning Schwentner present their method, a comprehensive approach for transforming architecturally eroded software systems at the strategic, technical, and team organizational levels. You’ll learn how to analyze business processes, break them down into bounded contexts, and apply domain-driven refactorings within Agile teams. Finally, this book offers guidance on designing the transformation process based on the current state of the existing architecture.
Packed with real-world examples and case-driven insights, you’ll uncover the tools you need to build systems that scale, support business agility, and remain resilient over time.
- Assess your system’s architectural health with the Modularity Maturity Index (MMI)
- Apply strategic and tactical Domain-Driven Design (DDD) to manage complexity
- Reorganize and align your teams with Team Topologies
- Use EventStorming, Domain Storytelling, and Scenario Casting to clarify design
- Refactor incrementally with patterns that reduce risk while delivering value
What Industry Experts Say
“If you are starting a transformation project, I recommend that you read this book.”
“I really enjoyed this book! It is the best DDD book on the market.”
“This book is packed full of practical advice on how to assess the current state of your legacy systems and options for transforming tangled legacy systems using the values, principles, and practices of modern Domain-Driven Design.”
“Transforming your legacy systems requires a whole range of skills, and you can find them all in this fantastic book.”
The Authors

Carola Lilienthal is an architect and coach at WPS – Workplace Solutions. She is the author of Sustainable Software Architecture and shares her knowledge at international conferences.
Homepage at WPS
in/CarolaLilienthal
cl@wps.de

Henning Schwentner is a programmer who has been into computers ever since he got an Amiga 500 in the early 90s. He was lucky enough to turn this passion into a profession and works as a coder, coach, and consultant at WPS.
He helps teams to bring structure into their existing software or to build new systems with a sustainable architecture from scratch. Henning is the author of Domain Storytelling and LeasingNinja, and co-organizer of CoMoCamp.
Henning is the proud father of six children in a very special patchwork situation.
hschwentner.io
in/henningschwentner
henning@domainstorytelling.org
Order
English Edition
Domain-Driven Transformation: Modernize Legacy Software and Mitigate Risk
Published by O’Reilly.
German Edition

Domain-Driven Transformation: Monolithen und Microservices zukunftsfähig machen
Published by dpunkt.
Training and Consulting
Get in touch for consulting or in-house trainings or book a seat in an open training.