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Reading this leaves me doubtful whether to use MongoDB or not again:

https://www.google.com/search?q=dont+use+mongodb

https://www.reddit.com/r/programming/comments/3dvzsl/why_you...

Do people at big startups use MongoDB in production?

This seems more like a limited-lifetime side project rather than an actual viable startup. I've used MongoDB for situations like this where I just need to stuff some simple data into a datastore and retrieve it later without any particularly complicated queries.

Personally, if I were the author, I'd switch over to PostgreSQL the second I start worrying about more complex queries, though.

I think schema-less plus excellent performance out of the box give MongoDB an edge. You also don't want to discard advance features like map/reduce buit-in in JS, chaining of commands, ability to have nested objects (think tables inside tables), ability to do atom modifictations to objects, etc.

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