As a developer if I knew you would need to support a ton of backends i will spend significant time building a abstraction layer which is backends agnostic and

As a developer if I knew you would need to support a ton of backends i will spend significant time building a abstraction layer which is backends agnostic and a framework to add backends easily. It would then be much easier to add new ones, even if I don't want to support them immediately Alternatively i would add support for one or two services directly, rewrite many times and come to the above model and add support slowly. Knowing you would need all of the backends would help immensely in the initial design