Looking for a Unity 3D app developer to build a prototype in 3 weeks – 3D Map based app for the tourists

I am looking for a skilled and experienced Unity 3D app developer to build a prototype app in 3 weeks.
It will be an ongoing project (more than 6 months at least) if you build this prototype well as we want and on time. This prototype is very important for us, so I am gonna hire 2 developers to build this prototype, and after 3 weeks, we will choose one winner by the result to give the full project.

Project summary:
– Integration of an existing map display (for example Google Maps), which contains wayfinding.
For Unity, for example, there is the following purchasable asset:
https://assetstore.unity.com/packages/tools/integration/online-maps-v3-138509
– Access to the API of the world heritage region. Access predefined visiting routes and POIs.
Display of POIs on the map
– Integration user login via Firebase. Automatic collection of data about visited sites in the World Heritage Region. Based on the time spent in a certain radius around POIs.
– Based on the visited sites, a suitable route through the World Heritage region is suggested to new users depending on the starting point (GPS) and visit frequency.

Target for the prototype:
– Everything on a low level. We need to show this prototype to the investors after 3 weeks, so it would be great if you build visual scenes and main functionalities first as much as possible on the prototype.

Our budget for the prototype: $200 ~ $300
It will switch to $5/hr~$10/hr, 30 hours/week for the full project if you win.