who was job and what did he do to belong in the bible?

A man living in the land of Uz, in what is now Arabia. (Job 1:1) God said concerning Job: “There is no one like him in the earth, a man blameless and upright, fearing God and turning aside from bad.” (Job 1:8) This would indicate that Job lived in Uz at about the time that his distant cousins, the 12 tribes of Israel, were in slavery down in the land of Egypt. By then Joseph the son of Jacob (Israel) had died (1657 B.C.E.) after he had endured much unjust suffering but had kept his blamelessness toward Jehovah God. Moses had not yet risen up as Jehovah’s prophet to lead the 12 tribes of Israel out of Egyptian slavery. Between Joseph’s death and the time when Moses by his conduct showed himself to be blameless and upright, there was no human with integrity like Job’s. It was likely during this period that the conversations involving Job took place between Jehovah and Satan.—Job 1:6-12; 2:1-7.

See

Who was Job

http://wol.jw.org/en/wol/d/r1/lp-e/1200002475

Maybe you should read the Book of Job in the bible and find out for yourself. Then come back here and ask your questions.

He was hard worker so he got the job.

He was a worshiper of the true God, he was as God said, blameless and upright.