Semaphore Solutions interview questions

Extremely demanding interview process. Completed three rounds of interviews, in addition to a technical assessment, in two days. The interviews were not conversational in manner, but rather two interviewers peppering you with questions for 30-40 min. I did not get the job, unsure why as when I asked for feedback I never got a response. The interview process is extensive - the very least they could do is take 10 minutes to provide feedback or insight.