Perguntas de entrevista de vagas de Senior Software Engineer Python da empresa Optiver

I solved all the hacker rank problems, difficult to estimate correctness of descriptive question. Overall i was very positive and looking forward to interview but after 10-12 days i got rejection without any reason. I asked but nothing was shared. I spent 3+ hrs behind the test and they didn't even bother telling me what did not work for them. So i asked but no answer from the HR.