I’m not sure I get it. You’re looking for an Unreal 4 developer to build a Gear VR application, but your brief refers to using provided assets that are what I assume to be 360 degree photographs. What exactly is Unreal 4 being used for?
This looks totally up our alley and I’d love to chat more with you about the project. Are you open to working with a remote team or were you thinking of having someone in house?