The interview process for a data scientist can take up to 2 months.

• Stage 1: Phone interview with hiring manager
  The call includes share screen coding, probability questions, and real data science challenges.
  
• Stage 2: Onsite interview
  The onsite interview takes about 6 hours. Questions range from coding, machine learning algorithms, data science experience, as well as some open end questions.

• Q 1: Suggest a modeling process for a binary classification task with skewed and unbalanced data.
• Q 2: Build a model to identify customers interested in receiving ad emails.
• Q 3: Machine learning questions like boosting, bagging and stacking.
• Q 4: Ebay has to identify the cameras from the similar items like tripods, cables, and batteries, what is the approach? (Data is title, description of the product, price, image, etc.)
• Q 5: Given a function roll() that uniformly returns a double between 0 and 1 and a array/list of numbers of length N (no duplicates), create a function shuffle() that returns a permutation of equal probability.

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