Black Duck Software Senior Staff Software Engineer interview questions

There was a screening to assess the capabilities by HR followed by 3 technical rounds. 1st round -> Basic design questions with easy DS questions and microservice questions. 2nd round -> Current architecture and internal working and medium DS and design questions. 3rd round -> Medium DS question, SQL and MS arch questions HR informed all the rounds were cleared and also he was ghosted after that. No reply to emails and no update. Waste of time attending the interview for almost 4 weeks