The first contact is just to know you and what you been doing and why are you looking to work at their company. A couple of days later one of the front end kids calls you to ask general questions about react and javascript, if you give good answers they will set up an interview with the whole team at their office. At this interview they will ask A LOT of web related question mostly focused on front end development and the React/Redux stack. They will also present some javascript code and will ask you to solve some javascrip problem on a whiteboard. After that they will send a coding exercise that you would have to complete in 3 hours.