There were three stages: (1) short coding exercise via email, (2) phone screen, (3) first onsite, and (4) second onsite. After the phone screen, I was given a ~4 hour practical coding project which I presented at the first onsite. I think the interview process was very straightforward, and the exercises were very representative of the work. I was impressed with the engineers and data scientists I met during the onsites, and I felt the CEO and COO did a great job explaining the product and the business space. Overall, it was a very positive experience.

The process started with a behavioral phone screen with the recruiter, then I was given an informal coding challenge over email. After the coding challenge, I had an onsite that lasted about 2 hours. It consisted of a behavioral interview, and a whiteboard coding exercise. Then I was given a project for a full stack application with a very loosely defined spec, and was called back for another onsite (1.5 hours) during which I was to present the project and have another whiteboard coding interview. Finally, I was called back for a 3 hour onsite which consisted of 30 minutes with the CEO, 30 minutes with the COO, 45 minutes whiteboard interview with a Data Scientist and I was taken to lunch with part of the team.