They cancelled a phone call 30 minutes before it was scheduled to take place.
I don't mind companies cancelling interviews, since if there's no mutual interest, an interview is a waste of time.
However, it is extremely unprofessional to do it at the last minute, since people might have actually had to adjust their plans to work the call in (i.e. work from home, take 1/2 day off, etc).
The following metrics were computed from 3 interview experiences for the Braze Software Engineer role in Canada.
Braze's interview process for their Software Engineer roles in Canada is extremely selective, failing the vast majority of engineers.
Candidates reported having very negative feelings for Braze's Software Engineer interview process in Canada.