I applied in-person. The process took 4 weeks. I interviewed at Starbutter AI (San Francisco, CA) in Jan 2017
Interview
There are 3 interviews, exercises, and a presentation. They go deep on the questions to make sure you have thought everything through. They ask technical, quantitative, qualitative, and behavioral questions.
Interview questions [1]
Question 1
They give you a task and ask the you present. It's basically what you will be doing so they are checking to see how good you'd be at the actual job.