Boston Consulting Group Senior Data Scientist interview questions

The interview consisted of a total of five rounds, and I'm currently at round 4. It started with a code signal online assessment (tested basic knowledge about data cleaning, data filtering, data joining with pandas as well as some simple ML with scikit). Then the first three rounds are technical case interviews. Each round consisted of about 10-15 mins for introductions, and 30-35 mins for a technical case interview, and then about 5 - 10 mins for questions.