Based on my experience with such firms this is the prevalent modus operandi. Hence I don't trust them. In our company we cannot commit code without review, an

Based on my experience with such firms this is the prevalent modus operandi. Hence I don't trust them. In our company we cannot commit code without review, and this turns up these "replacement" developers pretty quick. But it's pretty disheartening. You don't even make it 5 lines and there is .ToString() on a string, and it just gets worse from there. I used to take some effort in trying to be nice about it figuring the person probably who wrote the code doesn't know they're a replacement and is just doing the best they can, but I eventually stopped caring. Now I just butcher them, point my boss at it, and see how long it takes before they get fired.