Assuming that no kernel.request listener was able to create a Response, the next step in HttpKernel is to determine and prepare (i.e. resolve) the controller. The controller is the part of the end-application's code that is responsible for creating and returning the Response for a specific page. The only requirement is that it is a PHP callable - i.e. a function, method on an object or a Closure.

It was very fast for me. Two technical rounds, one hr. HR was always in touch to give details. Overall the interview process was good. The questions were not hard and were fairly easy.