In most cases you will have your ICAO license validated by the host country and in some cases you will be issued the local license after completing the required training.
As as far the contract job listing, I wonder if the outfit is actually FlYDubai because the requirements listed are different than what FlYD is posting.
For example 2000 hrs in type, 4000 hrs PIC and the age 50 requirement are not FlYD requirements. Could there be another airline starting up?