This was a HackerRank coding interview. I cleared it and was asked to come for an onsite interview after an HR interview. They booked my flight tickets.

But at the very last moment, they cancelled it, saying there was a last-hour change and they had limited slots. The HR also told me that he would get back to me for other interviews, but this role was off-limits. I have been emailing the HR since but got no reply till date.