Tourist visa is not an option for working visa though many a time company do provide employee visa for 30 days for their new joiners and during that time your company should complete processing of your work permit and residency …
As you have a hold only for 4 hrs and you are not going out in the city you dont need any visa for your further journey. Enjoy roaming around the airport.
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You will be required Dubai transit visa, for those requirements are given below-
Passport first and last page scanned copy
Latest photo (passport size) with white background
Current visa page copy