Pocket Gems Software Engineer, Backend interview questions

I was given hr interview and two technique phone interview. It really waste a lot of time(One or two month.). The questions are very simple. But the company is really irresponsible. They gave the result of the interview very late(couple days to one week. I even sent an email to the hr ask about the result). They change the date and time of the interview which makes great inconvenient to me. I answer all the questions in the two technique interview correctly. But I can not even get a chance to continue. Thus, I wonder if there is something wrong with this company. I think other candidates should consider carefully when you want to apply this company. It really waste a lot of time for nothing.

Phone screen. After the initial greeting, the interviewer jumped to a technical question without telling about himself or the company or the role. Overall, the interviewer was very rude. I wouldn't want to work here.