The phone screen was short, but went well enough - mostly they just told me about the coding challenge - and set expectations about the interview process. Then they sent me the challenge, which I completed promptly, and submitted a pull request to their github repo, as they requested. I let them know it was submitted, and was told repeatedly (when following up weeks later) that I would be receiving feedback, but they were busy at the time and hadn't gotten a chance to look at it. After a few months, they simply closed the pull request without comment, and haven't responded over email. They didn't follow through or communicate well, which I found rude, and a waste of my time.