Whole interview process took around 2 months, consists of 4 interviews.
First, it was with HR, in which they asked normal questions. Nothing special.
Second one was with the hiring manager, who was an iOS developer. He also just asked normal xcode related questions, which can vary depending upon the components you will use.(Was expecting some more architectural related questions as it was not a junior level position)
Then, I was asked to write a test project with just some simple API calls in swift.
And in last they invited me to their headquarter for an interview with the team. (which was the worst and loses my interest in working in the company). I flew from a different country just to meet with the team, and when I reached thier office, their HR person asked me to wait outside somewhere in cafe or anywhere and come in the office at the exact time in such a rude manner. And then in the team interview, instead of having some mobile mindset people, they put their web team members. Those who just know some googled questions. Their were some positive things, but, this negativity took all over the positive stuff.