I developed games for fun, one of them it's in Google Play with 9500 downloads.
I enjoy developing games, so I wont have any problem making your game.
I have a lot of experience with java, android, and unity game programming with over 3 years of experience, I have some game projects made from scratch, if you wants screenshots or something, just tell me.
Unity have good support for augmented reality, so I would make it in Unity.
It would be great to know more about your game, because the price and time are estimated.
Good day!