I have already done 2 or 3 connections with Facebook API in some apps, it is easy for me to do, and you can see results quickly.
By the skills required section, I understand that the backend is in node.js and the frontend in Unity 3D, is that right ? I have a vast experience with both. Just finished my bachelors as a top student, where I worked a lot with node and I am currently in my masters degree focused in graphical systems, so I am working with Unity 3D too.