Homework can't replace an interview, unless you're willing to hire people who can code without any idea if they will fit in with the team or be able to work with others.
That sounds intuitively reasonable, but does an interview actually have significant accuracy in filtering out people who will do badly on those criteria? As far as I know, such data as is available says human intuition is completely wrong about this and an interview is not significantly more accurate than flipping a coin.
