I was asked to provide a presentation for an initial interview. As much as I dislike companies who do this, since the mutual interest is not established, and they are asking for a significant amount of my time and knowledge, but I went forward since I was not working and had the time. This presentation took over an hour to prepare, and I shared valuable information from my experience in CS. I was then asked to email my presentation after the interview. I never heard back. I sent an additional follow up, still no response. Not even a rejection email. Bad taste on the process and company all around.