I love how early in the bible, Satan's role is actually to be the contrarian to God's designs. Doesn't actually commit any evil unless given permission by God to do so. Is kinda treated like one of the angels rather than the fallen one.
In the original Hebrew, Satan as he appears in Job is "the Accuser", and fills the role of a prosecutor. He isn't "the Devil", as he is generally thought of in Western culture today.