For react developer interview, you have atleast 1 year of experience in reactjs. And offcourse, javascript is backbone of react, node, angular etc. framework so you must be strong in javascript and its concepts.
Generally, for experience candidates it takes two round of interview, one is technical and other is HR round. If you are good in both the rounds you are selected for the this role.
Interview questions [1]
Question 1
States in class based components
Higher order components with real time usecase (code implementation)