Blockdaemon Principal Engineer interview questions

First stage interviewer with headhunter. Then and others have said, which I can now validate, the process just goes downhill from there. This company completely ghosts candidates. I spent a decent chunk of my time on the take home challenge, invited for interview, and then had no response at all from company after the interview, not even to say unsuccessful. This is toxic behaviour from an employer in this day and age. Do better.