Take home project: 5hours+. They are just fishing for people to improve their product. I spent a good amount of time on the model and optimized it to have a decent ROC AUC (~.9). When I discussed my project with their engineer, I was asked no questions about ML specifics, but only about how I could potentially improve the model and how to develop new features. 1-2 weeks later I was sent a generic "thanks but no thanks because we found someone better" email. After about 1.5 months, I was contacted by a recruiter for this exact same position. As others have mentioned. Its free consulting for them. A kaggle challenge with a carrot (job) on a stick. Don't waste your time.

I got a call from manager and discussed a position. After that I was given an assignment. It directly corresponds to what they are doing. It looked suspicious to me, because the assignment was simple, but obviously they are trying to reach the best score on certain dataset. It is a free Kaggle competition between candidates. Don't waste your time with this company.