Building software has the purpose of processing data - data flows into systems or must be made available to others. This is why we need APIs and this is at the core of the API first approach. The focus is on the API from the beginning.

In today’s approaches we often think in microservices and headless backend systems - two approaches that pushed the API first thinking.

What changes in the development process? How does the quality of the software increase? And how does API first make all stakeholders happier? I will try to answer these questions in my talk. I also want to show some practical tips and tools for APIs.