Coderpad has been a key tool that we use in our hiring process. The process is seamless with having a candidate join our season and coding a solution to the problem. My favorite feature is the playback feature. I have been using this to look back at the interviews to confirm my initial assessment.
It gets the job done. I can relatively easily create a coder pad and share it with a candidate. It has decent language support and I love the VIM keybindings option.