Conversational Contracts: Human‑Centered API Design with DDD and AI #mashup

In many organizations, APIs are treated as technical contracts — neat documentation of endpoints and payloads.

But what if APIs could become something more: living expressions of the business domain itself?

This talk examines how Domain-Driven Design (DDD) and modern API craftsmanship converge to establish a shared language between people and systems. We’ll walk through how techniques like Domain Storytelling, Event Storming, and Context Mapping can lead directly into OpenAPI and AsyncAPI specifications that reflect real domain intent — not just data structures.

How can LLM help?
Along the way, we’ll see how Large Language Models (LLMs) can amplify human creativity — helping teams turn visual domain artifacts into executable API contracts while preserving intent and nuance. Instead of replacing design thinking, AI becomes a collaborator in the craftsmanship process.

Through practical examples, we’ll explore how bounded contexts define API boundaries, how ubiquitous language shapes resource and event models, and how contract-first design enables safe, evolutionary change. By the end, you’ll see APIs not merely as integration points, but as living domain boundaries to align architecture, business, and shared understanding.

About the speaker
Annegret is Chief Software Architect at codecentric AG in Germany. She has worked in software development for over 30 years. She worked in quite different roles and domains. She is especially interested in DDD, microservices, and everything else. She is working on a large integration project and defines APIs for partners.

The Sponsor
This time, the location, food, and drinks are sponsored by TechTalk. Thank you very much, TechTalk, you rock! 🎉

This will be a joined event with the Microservices, Reactive and Distributed Systems Vienna Meetup (https://www.meetup.com/reactive-vienna/) and it is enough to register for only one of the meetups. It is not necessary to register for both!

Space is limited, so please register if you want to come. As always, we're very much looking forward to seeing you!

Best regards,
Daniel and Gottfried