Ways in which one can develop a modern API Web Sevice which is Enterprise level and Scalable

This is more of a general type of question. There are multiple ways in which one can develop API's to exchange data. For example: Python Flask, Apache Camel, Node.js, etc

And using Testing tools like: SoapUI, Postman, Swagger editor.

My question is what are the pros and cons of developing different types of API at Enterprise level to handle heavy load, is Scalable and Future proof