Firstly had a call from their HR. She asked me some background and set the interview for me. After a couple of days, I had the interview with a member of the tech team. He also asked me some background, like how's my project, what's kind of techs I'm using. Then he asked an algorithm question and we did coding online. I resolved these question but somehow I still got the email from their HR said not be pursuing my candidacy for that position without any reason. I'm confused about that.