They sent me a CodeSignal quiz. I took the quiz, which consisted of four algorithmic programming questions. None of these were relevant to the job, based on the job description.

Your score is automatically generated and shown to you once you finish the exam. I got perfect scores on the first three questions. For the fourth question, my code did what it was supposed to do, but it was too slow, so about half the tests timed out.

I thought overall I'd done well, but apparently Quora thinks frontend developers need to be gods of algorithms, because they rejected me soon after I submitted the quiz.

Questions involving matrix manipulation, counting subarrays which meet a certain condition, etc.