Swissquote Senior Java Developer interview questions

I received a call from HR and then was invited to do an interview onsite. Sent an e-mail to HR to see if i could get any feedback, but did not reply to my e-mail. Took them almost 1 month to give feedback. Rejected in all other positions applied - no reason given. Interviewers seem to have lost interest as soon as i failed to answer some questions, but they kept going.