Transfast Senior Software Engineer - IOS interview questions

I had applied through one of the job portals. Received call from HR within 2 days. Round 1 : Technical Round over Skype. once you clear the 1st round they call you for the Face to face round. Round 2 : Technical Round F2F Round 3 : F2F With CTO Round 4 : F2F With HR In my case 2nd, 3rd, 4th round were on the same day,