REST APIs are becoming the most common technology for distributed applications. When it comes to designing and implementing such APIs, the heterogeneity of technologies for designing and describing them can make integration and even development a nightmare. erocci provides developers a simple and standard way to describe these APIs, letting best-of-breed model-driven engineering technology doing all boilerplate work for you. erocci easily integrates with existing APIs as it follows the following standards: * HTTP / REST * Swagger/OpenAPI for API description * Open Cloud Computing Interface for data model In the presentation, we will explain the use of erocci and its extension mechanisms.