It was hard, and ultimately I didn't get a job offer.

People were very nice, though.

Questions included algorithms, systems design, and others.

At one of the interviews, an interviewer pointed out a mistake in my code, saying, "Is there anything wrong with the code?" I immediately saw my mistake and corrected it. That's the only thing I can think of that didn't go well, in my opinion.

I obviously don't know how I was perceived.

A few days later, I got a phone call from a recruiter saying I didn't get the job, but was encouraged to re-apply later.