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Only the first one is correct: 1. I thought you had a job.
It's a very interesting question. I don't think I've ever seen an explanation for this in a grammar or course book so I'll just give you my opinion as a teacher and native speaker.
If I say "I thought you had a job", it means "I thought you had a job but I now know you do not have a job." So we're talking about a situation that belongs to the past: therefore had not have.
To express the same type of situation, you can also use the past tense when talking about the future. For instance, if a friend is coming to stay with you and he or she arrives a day earlier than expected, you can say "But I thought you were coming tomorrow!" :-D:-D
For you to be able to tell me - at this moment - that you have found a job, then you must have found the job before this very moment, that is, say, yesterday - that is, it's past. So you must use the past tense. 'I want to tell you that I got that job.'
or 'I want to tell you, I did get that job (that I was telling you I was going to apply for.)
B. "I knew you got/get it." 'I knew when I heard you were going to apply/going for the interview, that you wouldget it.' or 'I know. I heard that you had got it.'