They used it at my 1st job, a startup. They had an ORM which made everything much slower, and the most common operation they did was to add items into lists, w

They used it at my 1st job, a startup. They had an ORM which made everything much slower, and the most common operation they did was to add items into lists, which causes the whole document to be resized and requires it to be moved. It could have been done with 1 sql server, but we needed 4 really heavy mongodb servers instead. And of course our code was buggy so the schema was all over the place.