If he got the job, he would be very happy now

Here is my opinion: When I read your sentences (type 2 conditional and more likely be type 3 conditional sentences), the way I understand is that your brother failed the job interview. However, in reality, you have not known the result just yet. In this case, I feel that you should use the type 1 conditional sentence to describe what will happen if your brother passes the interview.

If he gets the job, he will be very happy.

I find all of these sentences to be a bit awkward and ambiguous.

Here are sentences that I believe communicate the potential meanings better:

If my brother had gotten the job, he would have been happy.

If my brother got the job, he will be happy.

If my brother were to have gotten the job, he would have been happy.