The first step of the interview was they send a couple questions to solve on your own. I didn't even pass all the test cases but was still invited to the next step of the interview which is a phone call.

The first question was based around string and regex. Essentially they give you a formatted string and you had to tell whether the last string in the formatted string was present in the rest of the strings.

The second question was the Collatz sequence. It is #14 of the Euler problem so look up #14 Euler problem and it should pop up.