Need consulting on developing app like "facerig" for CG experts

Hi, I am interested in the skills used in app "facerig". I am not interested in mobile development. Rather I am interested in following aspects. 1. We can get landmarks from face image. And we can get the pose of head. Now you need to convert it into character's face. What steps will you take? 2. Can you implement voice conversion? If yes, how? It is alright if you answer either one. It is not easy to be good at both. If your answers are perfect, I will surely pay you. Best.