To apply for the job, you are expected to put in the work to learn a new software (Tableau) and create a visualisation from a dataset of your choice. Then you are invited to a "phone" interview with the head coach - it's actually a video interview. Then you're invited to the second stage interview ( or the early interview). This was an hour long video interview with 6 interviewers and you are also expected to create a viz within 1.5 week of receiving a dataset from the dataschool. Then the final interview, where you receive another dataset from them and create a viz in less than a week. Make sure you send it to the dataschool for feedback - they will point it out if you didn't; but if you did ask for feedback and they didn't reply, is it really your fault? They also don't take into account that you might not know the topic of the dataset at all and therefore needed to spend extra time doing your research - unfair but not to them.