The recruiting staff reached out to me via LinkedIn. They are very nice people and were extremely helpful during the interview process. The interview was very thorough, which has its pros and cons as an interviewee. I believe I had 5 technical interviews that were about 45 minutes in length on average. The process was spread over more than a month, I believe this was because Iterable is hiring a lot of engineers right now and is very busy interviewing candidates. There were no take home projects. I'd guess the entire process took about 8-10 hours.

Had an initial call with the recruiter, a technical phone screen, followed by 2 rounds of tech interviews, a project presentation, and 2 behavioral rounds. Make sure that you are well prepared for the technical and behavioral rounds.