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      Data Scientist Interview

      Jan 17, 2020
      Anonymous interview candidate
      Atlanta, GA
      No offer
      Negative experience
      Average interview

      Application

      I applied through a recruiter. The process took 4 weeks. I interviewed at CoStar Group (Atlanta, GA) in Aug 2019

      Interview

      First was a standard call with a recruiter. Then, an hour-long call with the hiring manager. During that call he gave me a SQL query to write and a python function to write. Second round was a phone interview with a VP where I talked about my general experience. Final round was an in-person interview consisting of another 1:1 interview with the hiring manager and a panel interview with 3 analysts. They did some more SQL whiteboard questions during the panel interview. Overall, the emphasis was on specific technical questions that heavily involved engineering concepts. It was pretty bizarre that they were asking questions like that to a data scientist.

      Interview questions [3]

      Question 1

      How would you calculate the mean of a column with billions of rows? (i.e. cannot fit into memory)
      1 Answer

      Question 2

      Write a program that finds the median of a list in Python... What is the time complexity of the function you wrote? [This exercise is pointless in a world where np.median() exists]
      Answer question

      Question 3

      What is the central limit theorem?
      Answer question
      1