One of my worst interview experiences. Applied through a recruiter and the process took about 2 weeks. No phone interview, they just sent a paper of 4 questions to complete. There was no clear time limit on how long was required to complete all 4 questions. Questions were not worded clearly, and it was difficult to know exactly how much detail they wanted to see. The difficulty of each question wasn't that hard, but they were definitely time-consuming. The feedback I received was "not enough machine learning shown", which I think could have been avoided if they were more specific in each of the questions. The overall feedback wasn't very helpful. They also expected me to explain everything about the pros and cons and the reasons for me using particular libraries (which again wasn't clearly worded in the question). Overall, I felt like they were expecting very detailed solutions for a set of simple and poorly worded questions. Given their expectations on each question, I'd imagine it being extremely time-consuming for most candidates to complete everything within a week to satisfactory standards if they have multiple other ongoing applications. I wouldn't recommend applying unless they change their process and improve on their questions and overall expectation.

A very long technical take-home test, that for the most part was unclear and open-ended. A technical interview was then conducted, which was awful. The interviewers were very unfriendly and constantly trying to catch you out rather than letting you explain what you did in the test. One guy kept on trying to catch me in a lie... and he didn't succeed as I wasn't lying about anything. I was not surprised that I didn't proceed further, but I would have withdrawn my application if I did because I would not be able to work in such a hostile environment.