Interviewed twice for different roles. One interview seemed like the hiring manager was quite a bit less senior than myself, thus the role was not well matched for my seniority or expectations. Another interview went relatively well, but some company specific areas where I was not familiar with were the only hesitation voiced and the interviewer asked for me to create a detailed 6 slide technical presentation on those areas to submit to him to determine if we could proceed further based on my ability to learn it...... I decided to take the punt and burn a weekend learning the specific technical content. It was all simple to grasp, but just took a long time to gather all the content, process and create the presentation. I sent the presentation, which in reality should have been sufficient to enter a second round interview. But I wasted a lot of my personal time with no tangible follow up from the interviewer.