Indications of the lifestyle of Job are consistent with the time of the Patriarchs; he may well have been a contemporary of Abraham. It is generally considered to have been written first, but it is not altogether clear when and by whom. Moses of course came about 500 years later, although his five books cover a time span from before, during, and after Job's time.

The book of Job was written BY Moses, in the wilderness. It was completed by 1473 B.C.E. and covers the period of 140 years between 1657 B.C.E. and 1473 B.C.E. The other books written by Moses are; Genesis [completed 1513 B.C.E.] Exodus [ 1512], Leviticus [ 1512], Numbers [ 1473] Deuteronomy [ 1473]. It does NOT predate the other books.

We do not know the age of Job. SOme Jewish traditions ascribe it to Moses, but others to a variety of writers including Elihu, Solomon, Isaiah, Hezekiah, and Baruch, Jeremiah's scribe. The text itself gives no clue as to authorship, so it must remain anonymous. The author of the article in Wikipedia gives a good case for the book being placed either just before or after the time of the Judges, due to their being no king mentioned in Israel, the fact that Job was a herdsman, and that there were tribes of herdsmen on the borders of Israel at the time of the Judges, who frequently raided Israel. The fact that we do not know who wrote it does not negate its worth as a valuable teaching text in the Bible.

Job was written by the Egyptians. It probably dates back to the period (4000-2000 bce which would be during the age of tarus). It pre-dates anything recorded in the christian bible.

Many stories in the bible may well have mutated from Sumerian myths, legends, and motifs, as did Greek mythology and many other religions. Basically, we all extend from the same original tribe(s).

Some Bible scholars believe it was written before hand and it set before the flood of Noahs day.

Genesis was probably written on individual tablets, mainly because every once and a while there is a "these are the generations of..." indicating multiple records of history. Moses was associated with the Pharaoh's daughter as we all know, so he probably could have gotten these tablets somehow. Maybe the Hebrews passed them down. Then, most likely in the wilderness, Moses put together these tablets to create Genesis. Along the way he wrote the other books. Job must have come around the time of the judges or the time of the Patriarchs, because he did an animal sacrifice for his children's actions, which was only done under the Mosaic Law (and, of course, when Abraham gave an animal sacrifice that one time). I can't be sure of anything, but this much can be understood: Job didn't have any kind of Scripture, none, for guidance, so he was most likely born among the Patriarchs. Job 31:35 - Oh that one would hear me! behold, my desire is, that the Almighty would answer me, and that mine adversary had written a book. Evidence also suggests that Sumerian myths descended from the Genesis account, and not the other way around. Know your history.

I think that Job was not the first book written. I learned that Exodus was written first after the Hebrew people were exiled in Babylon. Whilst in Babylon the Hebrew people were strongly influenced by the stories of the Babylonian god's. This lead to the writing of Genesis 2 by the Yahwest authors which was adapted to suit the people who had strong beliefs in polytheistic gods. About 100 years later Genesis 1 was written by the Priestly authors. I'm unsure of when the rest of the pentachuech was written but it was apparently not actually written by Moses.