I was contacted by a recruiter following up on a referral. The first phone call was just to go over my resume at a basic level. After the initial contact, I was transferred to a coordinator to schedule the tech screen. Tech screen is with an engineer, and comprises two DSA-style questions, roughly medium difficulty. The week after the screen, I was informed I passed and was transferred to loop scheduling. The loop for Software Engineer (Product) comprises 2 coding interviews, 1 Product Architecture (system design), and a behavioral session, each 45 minutes long. These were frequently rescheduled due to interviewer cancellations, and several times I had to move other companies' interviews around to accommodate these changes. Overall, most of the interviewers, including the tech screen, were professional, polite, and engaged. But one coding interviewer was disinterested from the beginning. They ignored questions I asked for clarification and were responding to oncall pages during the interview. When I explained the algorithm I wanted to write, they agreed to them, but did not seem to follow the actual code at all, even though I walked through the example multiple times. In the end, they pointed out a special case I missed, which I had explicitly asked handling about early on. In the second question, things appeared to go smoothly, until they asked me a followup question that required in-depth knowledge of language specific implementation details. When I started to explain my thinking, I started with "I don't exactly know how this is implemented in [language], but..." They interrupted me and condescendingly told me to "look it up later". I just don't believe I could have done well with this interviewer no matter the content of the interview.