I went to ETC, a challenge they organized at our university. I talked to people at the careers fair and applied online.

I got feedback fast and made a decision quickly.

In the end, the interviewer called 40 minutes late and didn't apologize, just started asking questions.

We had a shared screen for coding, and I was given a hard problem straight away, with no brain teasers or probability questions. Another guy from my university got the same question, but at least in the second round!

The interviewer was very unhelpful and gave no clues. They probably got bored with me after the first 10 minutes, so they didn't make any effort. They kept saying how the time was up and they needed to go, so we just cut it short. It was ridiculous.

Revise hash functions, tree traversal