Based on their rich experience, our delivery team has developed the best technology stack, which includes: 1) Front End part -React for the web and React Native for mobile; 2) Node.Js and Nest.Js framework for the Backend; 3) MongoDB or PostgreSQL as a database; 4) AWS cloud base. We have repeatedly used all these technologies for all our projects. They showed themselves well, in particular, in the development of gamification for learning apps.