Two Sigma Software Engineer interview questions

Started with a 3 hour online coding test consisting of 2 algo questions, followed within a few days by a phone call with an internal recruiter, and then a few days later a pair-programming test with an engineer in NYC over the phone with a screenshare (this also included a brief round of what seemed like arbitrarily-selected but pretty standard CompSci questions). Finally the F2F day consisted of a morning of technical interviews which included some problem solving on a macbook, followed by lunch with a couple of employees. After lunch I was abruptly informed by an engineer I hadn't met that I hadn't quite made the cut, and was asked to leave the building. No explanation was given at the time, and no feedback has been received since, I was effectively ghosted from that point onward. This had been a fairly positive experience up until the end, but having invested a significant amount of time and effort into the process, I found it incredibly disrespectful and unprofessional to not at least provide some basic feedback in return.

I had a phone interview with a recruiter after submitting my resume through a third party job site. She told me that the next steps in the interview was to talk to a recruiter within the company so they can help me find the best fit within their teams. I had a second phone call with a recruiter, and he sounded as not interested to talking to me and after that call there was no follow up which was totally unprofessional and a huge waste of time on my part as I had spent a lot time preparing for technical interviews but the recruiter failed to follow up to set up one.