Hi, a forum is a bit like a chat app. And there are tons of examples of chat apps in flutter. Maybe you can start there
In terms of AWS it looks like there is fewer info than with Firebase, but a quick search showed a couple of results. Don’t know if they are good as I haven’t seen them: For Example
There is more information of
Amplify, I don’t know if that is what you are interested in. If that is the case you should really think about what you need to do, as in many cases
Firebase is cheaper. There is a great video about this by Jeff Delaney - Firebase vs Amplify
It is true that Firebase doesn’t have a “Stop” button, but from where do you take the idea is expensive? I think it is one of the cheapest and best solutions out there. More even if you take into account all the time you would be paying for a server while developing and getting the first thousands of users. In Firebase that all would be free.