can I make a website like stackoverflow with firebase firestore?

[Ahmed Osama]

Say, I am going to build a website(and a mobile app, too) just like stackoverflow. Here are my questions :

1. Is firebase reliable enough to make a site like this, that probably has millions of visitors everyday ?
   
2. Should I use mongoDB or SQL instead ?
   
3. I really don't want to write the back-end myself but I am afraid that later, I will have to migrate to sql or mongoDB when database scales to millions of users. so, How hard will that migration be ?

I have seen many posts that talk about that firebase should only be used for small projects that require real-time updates like chatting apps and so, is that right ? I thought that was the case with real-time database but with the release of firestore, it's supposed to be as powerful as mongoDB. Am I right about that ?

[Sam Stern]

Hi Ahmed,

You could build your website successfully on Firestore.  You could also built it successfully on MongoDB or on PostgreSQL or on so many other great databases out there.  In any case you will need to deeply understand the database you choose if you want to scale to millions of users.

You may be interested to read this blog post series (from 2016) detailing how StackOverflow itself is architected:

https://nickcraver.com/blog/2016/02/17/stack-overflow-the-architecture-2016-edition/

- Sam

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