Curai Machine Learning Research interview questions

Interview with the research director followed by a staff researcher. The interviewers were friendly and gave me plenty of time to ask questions. They do NLP research but neither interviewer had a strong NLP background, which was a bit curious. It's been several weeks since the last interview and I haven't heard back from the HR, which I find unprofessional. Other companies I've interviewed with for similar roles all had a policy of getting back to candidates within a week, so they're subpar in this regard.