I got an email link to the coding challenge, they gave me 2 days to finish that. I'm writing this review in desperate because is only about 14h left and I still not get all the case right.
I applied through an employee referral. The process took 4 weeks. I interviewed at Quantcast (San Francisco, CA) in Aug 2018
Interview
First received a hacker rank code challenge, which I had 48 hours to complete, and got all test cases working. The question was "Query by Example." Next, I had a screen with the recruiter, who informed me there would be two technical phone screens and then an onsite. I apparently didn't pass the technical phone screen.
They scheduled a Coding Challenge for 48 hours. The recruiter said I can take as much time as needed, it will not affect the decision. But I heard from another friend that another recruiter asked them to finish within 3 hours.