I had a recruiter screen, which was reasonably simple as most of them are. They just asked about my experience and motivation, etc. The next step was a take-home exercise where you have four hours to make a REPL. They can't really see how much time you spend on it. I did it in about two hours.

I sent my REPL in and then got rejected a day later. I asked for feedback but was just told they wanted to go forward with other candidates. The REPL I wrote was good, so I have no idea what they are looking for. If I had to guess, I would say they probably let everyone who is remotely qualified do the recruiter screen and the REPL task. Only then did the real selection probably start, and there was probably someone with a fancier CV than me. Either way, they were fast to get back to me, so I can't fault them there.

Write a REPL program in four hours.