Hi,
I'm the manager of Owl Bytes.
Here, we deal with international customers for software development and also games (Baby Owl Studios, is our game branch - see @babyowlstudios in social networks).
All our team for Baby Owl is composed by people graduated from the first Digital Games Course in Brazil, with solid expertise in areas such as development (C++, C#), GPU, Open GL, Unity 3D. I already have in mind the engineer who feet exactly your needs. Please, feel free to contact us and we can share portfolio and also have a video call to chat about the demo you need to validate our expertise.
The final price and schedule may be discussed after we agree about the scope.