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I will create a custom API for you web app.I can do many thing from simple CRUD to complex application.I can handle JWT Auth, connect to another API, Websockets...
The example is the auth part of one of my apps viewed with FastApi Docs.
Also, I can help you hosting your Web App.
I can integrate a simple frontend, but I'm not designer, so if you don't provide design you'll see what happen when a backend dev do frontend.