Applied online via 23andMe's website. Received HR correspondence within two days and scheduled 30-min phone chat with hiring manager two days later. Was notified to come in for in-person interviews on-site in Mountain View. Final round consisted of five 45-min interviews. HR rep let me know the next day that I had one more interview via Google Hangout. Heard back from HR rep that I would be contacted by HR director for next steps. After an initial discussion about career goals and expectations with the HR director, I was given a verbal offer. Entire process took 2-3 weeks.
Interviews were mostly about past experience, skills, and projects. All of the interviews felt more like conversations and everyone was nice and genuinely interested during the discussions. A couple of interviews were formulaic (i.e. it's clear that the interviewer had to hit a list of questions) - but that's expected. Lots of behavioral questions (i.e. what is your approach to X - can you give me an example of this).
I had a great experience meeting with the 23andMe team. Everyone was smart, dedicated, and very down to earth - what more can you ask for in colleagues? I liked how they gave me the opportunity to speak with many people on the team - really gave me a sense of the culture and it showed me how thoughtful they are as a company. Overall, it was a very pleasant experience and I could see myself working there in the future, if the right opportunity is there.