DRW Junior AI Researcher interview questions

The process starts with an online assessment which has two very easy data analysis and model building questions like cleaning the data, filtering the data, running regression etc. second step is the virtual onsite interview which consists of three back to back rounds each of 45 minutes. One is with the hiring manager and then two with AI Researchers/Data Scientists. Third is the final interview with Director and then the offer. I was rejected after the second round. The HR person was not very helpful and never responded timely. All my interviews went quite well and still got rejected after 10 days with a generic email from the HR. I reached out to her for feedback but never heard anything.