A very protracted and frustrating interview process that doesn't respect candidates' time and is riddled with a lack of transparency and communication. I've lost a lot of respect for the company after this process. The general process was over about 2 months: phone screen w hiring manager --> take home test --> case study via videochat --> onsite --> follow-up case study via videochat & chat with manager The take home challenge, as others have already commented, is quite open ended and is a lot of work. I can understand how take home assessments have their place in the interview process but most of the difficulty in this assessment is in how poorly formatted the data is and in navigating what you're exactly supposed to answer. I then did a video chat with a data scientist through a case study question and then an onsite. After over a week of no update, I followed up and was asked to chat with the hiring manager over alignment of possible projects. The way this was communicated to me made it clear that this was a chat over projects and not a technical interview - I even clarified and made sure of that. I video chat with the manager at that time and promptly get another technical case study interview that I wasn't prepared for. I get notice later that they wouldn't be moving forward with my candidacy. The recruiter did later acknowledge the miscommunication and apologized, for whatever that's worth. I will say that the data scientists I met were generally very nice and mostly knowledgeable, although there was a wide discrepancy in skill levels. There's a lot of former consultant types in the data science org at DoorDash and it's reflected in their interview style -- besides the ridiculous take home assessment, there wasn't a single technical question asked, it was all case studies. But I'm not a fan at all of how long the process was, how unnecessarily burdensome it is regarding the take home assessment and the sheer number of interviews I had to do, and the lack of communication and transparency in what to expect. The recruiter for the role is new and they seem to have changed their recruiting process recently, with the the candidates suffering for these errors. Overall I think it was a waste of time.