One phone interview, some online assessments (Hogan and Raven assessments), and a 3-part in-person interview. The interviews were standard behavioral interviews, an "intellectual curiosity exercise" discussing whether it was important to measure happiness in employees, and a quantitative exercise involving designing a statistical model and interpreting graphs. The last interview person didn't walk me out, so I was left to wander around the building and find my own way out, which was not only awkward but also probably unsafe for the company. Once I got the offer, there was also a background check using a truly incompetent and frustrating third-party vendor called HireRight. These days there is also a drug test.