Solactive Index Analyst interview questions

First round was a meeting with a group lead and an HR. General questions about background, why solactive? Got a coding challenge related to index rebalancing (offline ~ 1 week time). Final interview with the team members (1 hour)

Very unprofessional hiring process, in the end I was lucky not ended up there because I am with a way better employer. Initial interview with a teamlead was postponed for 1 or 2 weeks on the interview day, I was told the interviewer was on a leave or sick (can't remember clearly but it sounded like an excuse). Later I was interviewed by the HR, I thought it went well and she seemed to like me, but I received a general rejection without a reason. I wrote to ask if I could get some feedback, no response. I do think I deserved a good reason after the back and forth communication and the long waiting and preparation.