Applied online and received a link to an online assessment to complete on their platform the next day. As mentioned by others it consisted of 3 parts (JavaScript, React multiple choice, React project) with an allotment of 90 minutes to complete. If you choose to apply, be prepared for all of the invasive, proctored nonsense that comes with this. You're required to give ongoing webcam access and window management control to HackerRank for the duration of the assessment. Even if you can get passed the dystopian nature of this in principle, it seems like a pointless baseline to measure by as it creates unrealistic conditions in which no programmer would ever actually work (i.e. someone watching them and not allowing them to looking anything up).