I was asked to complete a coding challenge prior to the interview - they ask you to do it in a language within their stack. Then was invited for an interview which lasted for an hour.

Multi-dimensional aptitude test, screening code challenge, interviews with senior management as well as multiple members of the engineering team. It was a long day, but it was probably the biggest factor in convincing me to choose Ratio over the other job offers I had received. If a company can make the interviewing process pleasant, there is a good chance life will be similar in the day-to-day.