Interviews are quite casual. They generally ask for a description of your toughest challenge. Passing the interviews are about demonstrating confidence, competency and enthusiasm. Successful candidates are those that can defend their work and demonstrate a passion for problem solving.

Very unprofessional behaviour overall. Communication throughout the process was horrible. Sending emails at 3AM, not responding in time etc. They even scheduled an interview and then failed to send the meeting link at one stage.