BlackRock Data Engineer interview questions

Starts with online coding challenge. Then technical phone screen and onsite. Very unorganized HR and interview process overall. The day of the onsite interview the interviewer showed 10 minutes late and told me that he did not even know that he will interview me. After onsite received a rejection letter shortly followed by another email the day after apologizing for a mistake in the system and sending the wrong email. After waiting for more than 4 weeks regarding decision and contacting the recruiter he told me that they have not made a decision yet... I would avoid applying to this company at all cost. It is a huge waste of time and effort and they do not even value your time you have spent...