Specification-first approach in API development process

Specification first development is a philosophy about how to develop APIs more efficiently. If you follow the “specification first” philosophy, you write the specification first and use it as a contract to which developers write code. 

I will tell you why we decided to switch to this approach in our project, what tools we've chosen to make API development and testing much easier, and, of course, the difficulties and challenges we encountered. 

Part of the talk will be about using Postman as our development platform – API Development Platform. I'll answer the question – why Postman? What functions we use to do our work. I'll tell you what features it has that allow us to implement a specification-first approach.