Technical case interview which is a mix of modelling skills + classical case interview structure
Data Scientist Trainee Interview Questions
40,238 data scientist trainee interview questions shared by candidates
How do you take millions of users with 100's of transactions each, amongst 10k's of products and group the users together in a meaningful segments?
Asked coding and data flow questions. The interviewers were friendly, but the questions were more centered on computer science than I expected. There were no social or general case study type questions.
The data challenge is pretty standard, give you a data set and let you build a predictive model and put together some insights. Phone and onsite interviews are all technical interviews. Some statistics (sampling, hypothesis testing, power calculation, etc.), some product sense (whether to launch some features, why some metric changed, etc.), also a CS-like question.
How many colors do you need to paint a graph that is built from a union of two trees?
behavioral questions about location and fit
How would you correlate each device a person visits the website with back to that person?
What is inner, left and outer join?
If you had 1000 factors for a ML model, how would you go about reducing this and how would you know when to stop. reducing
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