Boy howdy, you and I are so entirely on the same page in this regard. There are really two issues there:
1. Having multiple people's tastes poisons Netflix's ability to come up with very good matches for both of them. I know this intimately well -- my wife and I share a profile (it's not a money thing, it's just that we're sharing devices). That means I get to deal with her love for depressing documentaries and she gets to deal with my love for Pixar movies (which she finds to be emotionally manipulative. Don't look at me, look at the lawyer I married);
2. It'd sure be nice if you could sit your kids in front of a Netflix device and not worry about them being recommended Dead Snow because they liked Snow Day;
The first problem is relatively harder to solve; once Netflix solves this in the protocol, the people who build Netflix boxes will need to incorporate these changes into their client. You'll likely first see this in PC and PS3 streaming (because we can update the client whenever we want to), followed by other devices.
The second problem should be easier (though, personally, I fear the inevitable point at which we'll screw up and a non-kids thing leaks into a kid profile accidentally).
And Netflix has said that it's actively working on both of these issues.
As for jobs ... I'm really not hot on publishing my work email address on slashdot -- that way lies madness -- but http://jobs.netflix.com/ is your friend.