Always a good starting point is to look at what types of Developers they are trying to hire.
Both sites are looking for:
- PHP Developers for Back-End development.
- iOS and Android Developers for mobile.
Assume both applications use PHP and Nginx for backend. Which other technologies are more suitable in your opinion than PHP or Nginx? I am trying to learn back-end development and I will create a clone of LetGo as a project.