Create a platform for storing APIs with DDoS protection

It is necessary to develop a platform for storing APIs of various services with DDoS protection. You need to approach the project seriously and thoroughly, starting with the selection of servers, ending with the choice of development environment and programming language. Preferably, the service itself is developed in Java (JSP). The API download method should be uniform across all services. Attention! The platform should not handle requests, it should reject them according to the API service declaration and repel DDoS to the server. The project is a startup with a small budget, but in the future we plan to enter a large market with good turnover, salaries and offices in various cities.