Sometimes, the development process implies that you create a new microservice or endpoint that uses another API, listen to a queue, or use some external resource. What happens if you need to test your logic if the other resource is not available yet? How can you deal with a situation in which the other team is delayed in building the resources that you need? As software development evolves, the demand for rapid, collaborative, and efficient API development becomes increasingly crucial. Sometimes, it is not an option to wait until the other team or company finishes their work, publish the API, queue, or external resource to use, and check if everything works fine. In this talk, we will delve into the paradigm of using Microcks, an open-source tool designed for API mocking and testing, to parallelize works and elevate the API development process to new heights. Attendees will be guided through the intricacies of traditional API development and testing, highlighting speed, collaboration, and efficiency challenges. We'll draw parallels to everyday development tools and demonstrate how existing solutions might fail to address the need for seamless collaboration and accelerated development.