Book: Crafting Great APIs with Domain-Driven Design

Crafting, testing, and maintaining events and synchronous APIs represent one of the most challenging tasks in modern software applications. This comprehensive guide delves deeply into the intricacies of managing asynchronous and synchronous APIs using a consistent design approach.

The uniqueness of this book lies in its emphasis on collaborative API design between IT and business experts, facilitated by Domain-Driven Design (DDD). It provides clear guidance on selecting the appropriate communication strategy for different scenarios, ensuring that APIs meet the evolving needs of both developers and end-users. Readers will gain valuable insights into using popular definition languages such as OpenAPI and AsyncAPI. This book offers a case study that demonstrates how the described methodologies can be applied to modernize legacy systems, ensuring compatibility with development practices.

By the end of this book readers, will be equipped to design APIs that are not only technically sound but also intuitive, reliable, and adaptable to the dynamic needs of modern applications.

You Will:

• Learn how to choose the most appropriate communication strategy for different scenarios, considering factors such as scalability, reliability, and compatibility with modern development practices.
• Explore the practical application of popular definition languages like OpenAPI and AsyncAPI to create robust APIs
• Learn how to facilitate collaborative API design between IT and business experts using Domain-Driven Design (DDD), ensuring that APIs align with both technical requirements and business objectives.

Now Available!

Published on October 28, 2025, this book bridges the gap between technical API design and business requirements through Domain-Driven Design principles.

Target Audience

This book is designed for:

• 🏗️ Software Architects - Strategic API design decisions
• 📊 Business Analysts - Understanding API business value
• 👩‍💻 Developers - Practical implementation techniques
• 🔧 IT Professionals - Integration and modernization strategies

Authors

Annegret Junker
Expert in collaborative API design and Domain-Driven Development

Fabrizio Lazzaretti
Managing Consultant specializing in event-driven architectures and API design

Get the Book

📖 Available Now: Crafting Great APIs with Domain-Driven Design: Collaborative Craftsmanship of Asynchronous and Synchronous APIs

Related Content

Conference Talks:

• Domain-driven API Design Talk - Conference presentation covering the theoretical foundations from this book
• How to design AsyncAPIs in Workshops: The API Product Canvas - Collaborative AsyncAPI design methodology as described in the book
• How to design OpenAPIs in Workshops: The API Product Canvas - Collaborative OpenAPI design methodology as described in the book