comiXology interview questions

I got an email from the Amazon HR to know about my skills and have a quick discussion about the opportunity. The interview process was spread over 3 weeks for just 2 calls which is a lot of waiting.. One setting up some time, the HR went through the resume and asked general questions. At the end of the call, the HR asked me if I would be willing to answer a couple of technical questions. I said yes sure and she asked me about basic data structures. She told me to brush up on DS and algorithms. After 1 week, I got another email from the hiring team HR and she asked for 5 different time slots to setup a technical discussion. I had a call with the Technical manager and he explained about the company, team size and his requirement. The upon clearing the basic Android questions, I was given a code writing challenge with the coin problem question. After a bit of hint, I was able to complete it. But the interviewer was expecting an answer as I've just graduated from College.

An initial phone screen, led to an in person one on one. Then following-shortly they called back for another in person with the leads of the dev team. It was a shorter interview process than most, with a quick turn-around. Not to mention their team is super sharp.