ServiceTitan Senior Software Engineer interview questions

On the first technical interview day, I received an email three hours before canceling the interview. In a follow-up, it was explained that they had made an offer the same morning, but the offer had not been accepted, and they could still reach out to schedule another interview. This is an extraordinarily disrespectful and offensive practice, independent of any other possible reasons. Candidates prepare for interviews; these people just wasted my time, not even wanting to test me. As a Latino, I can't help but feel discriminated.