MegaZebra Senior Backend Developer interview questions

First I had a call with HR, she was super nice and friendly, and gave me big picture of company and position. She asked me general question about me and my experience. Second call was with another HR. It was very good one, she asked me really good situational questions. It was very interesting and inspiring. Third interview was with Team lead and CEO. It was a technical interview with very good and meaningful questions, but there was a lot of questions hard questions so it was a little bit exhausting, although questions were very good. After that I gave two references, and CEO called one of them. At the end I got the offer.