Even a mediocre developer should be able to put together a workable prototype of a simple web app and/or API well within a single week, including setting up web servers, databases, and other basic infrastructure.

Experienced developers are often much faster and more efficient. This is especially true if they're using a language like Python that is quite suited to prototyping, and already offers so much pre-made functionality in the form of libraries and frameworks.

Many of us have learned to be very skeptical of these services that claim to allow software systems to be build rapidly. This often only holds true in a very, very small set of cases. Otherwise, the moment you try to do something unique or unusual, you'll hit one roadblock after another. It doesn't take long before the supposed "time-saving" or "effort-saving" service has wasted more time and effort than it would have taken to develop everything from scratch.