Ghosted by recruiter after giving all rounds. Was asked to join interview in person . It was sudden ask couldn't agree and had been ghosted. I was thinking would get offer.

One of the recruiters contacted me about the job opening. First round was a assignment coding round in codiility. It had 3 questions on DSA, API design and SQL. Second round was scheduled next week. It was a intro / managerial round. They asked to design and optimise a API. Next they scheduled a DSA round. Which the interviewer bailed out for 2 times. After 2 reschedules, in this round they asked a basic DSA question. I completed it almost correctly. They also asked about work history etc. Next day I got rejection message. It was a waste of time. They rescheduled 2 meeting without prior notice.