Workiva Senior Software Engineer interview questions

The first two interviews with HR and phone screen went great. Then my terrible experience follows (this may sound like a paragraph of excuses, but bare with me). I applied through a recruiter and really relied on her for next steps. I had repeatedly asked if there is anything I need to do or prepare for the last interview, which I was told no, it was just conversational and meet and greets. I got the itinerary to be in Ames for 4 hours. At this point, I should have gone with my gut and done my due dilligence. No, I blindly take her word for it and get thrown into a 4 hour grilling (not terrible, but hell for anyone unprepared). I answered poorly. I knew it. They knew it. I wasn't prepared to explain projects or pass a simple tech screen. Which leads to the next point that ultimately delivers certain death of my candidacy. Again, I was not in the least bit prepared (my fault, I know, should have just prepped like normal instead of listening to a recruiter) and I hadn't done and back-end work in 3 months, as I am at a client for front-end only. Let me list why it was bad. It was a tech screen others got to do at home. Not a big deal, except they had a chance to get familiar with coderpad. I didn't. They use MacBooks so typing on them was like typing on glass shards. Their whiteboard wasn't working. All that was a pen and paper. In summary, I had to do a tech screen that was infinitely harder where other candidates had a chance to familiarize with coderpad, its autocomplete benefits, a chance to actually know they are getting a tech screen, their own mouse and keyboard they're comfortable with, a whiteboard, and actual time to prepare for it. I got a pen, paper, and two guys looking over my shoulder (they were super nice and professional though). Of course no feedback. I don't need it to know why I failed it. Any competent mid-level could pass it, so obviously failing something you know you could pass would be frustrating as all hell. Plenty of blame to go around, but do your due dilligence like normal and you'll be fine. Don't be like me and assume everything is awesome.