Ebury Senior Software Engineer interview questions

First HR call, nice one with a person in UK. Second one is with a Tech Lead who is gonna ask about your experience, this was very good too. After that, a code challenge is sent, there are four iterative excersises, not too hard, not too easy, I think was a fair one. The next stage is a system design interview, that one was tricky they give you a typical scenario where you provide a solution. I did not pass this one and I got the mail with the reject