Hi,
I have over 20 years experience in programming with more than 15 years in web development and quite some years with mobile apps.
As far a I understood you already have some website and now you want it to be connected to some API. I can do that, as I already developed and connected a lot of APIs in my entire live.
Please provide me with more details or documents - if you have. So we can talk about the specifics.
I do the "agile development" approach - meaning, that through the entire process I update you with new versions, as soon as it has some major changes / new functions. You can than check the progress and we can talk about how you like it and what has to be changed.
I will be happy to hear from you soon.
Best regards,
Fabian