Amazon Data Scientist Interview Questions | Glassdoor

Amazon Data Scientist Interview Questions

Interviews at Amazon

41 Interview Reviews

Experience

Experience
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21%
36%

Getting an Interview

Getting an Interview
37%
34%
21%
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3

Difficulty

3.1
Average

Difficulty

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Helpful (10)  

Data Scientist Interview

Anonymous Interview Candidate in Seattle, WA
No Offer
Negative Experience
Average Interview

Application

I applied through a recruiter. The process took 2+ months. I interviewed at Amazon (Seattle, WA) in April 2016.

Interview

A very, very long process. 2 phone screeners, in the space of 3 weeks 1 resume based(I had relevant experience) and the other had a coding component(I was given the option of SQL, SAS, R and Python) and a Market entry case. After this stage, I had to wait a 6 weeks before I got a call for an onsite interview.
Onsite, I had 6 back to back interviews. Each interview tested at least 1 leadership principle and also tested problem solving skills. The first interview had a really simple case question that I royally messed up with complicated thinking(I am almost certain that this cost me). The second interview had SQL. My lunch interview went a little awkward because my interviewer decided to throw a probability based puzzle out of the blue in the last 5 minutes and I couldn't solve it in time.
Post lunch, everything went quite smooth, I was asked a forecasting based case, about Holt-winters method and ARIMA.
3 days after interviewing, I got a call where the HR started off by saying "The team really liked your background and experience and were impressed by you BUT, have decided to not move ahead"
When I asked for feedback, there was none given to her. So after around 9 weeks in the process, felt a tad devastated to get a reject, I had invested a lot of time and preparation for Amazon.

Interview Questions

  • We need to sign an NDA, this means the high level questioning above is it.   Answer Question

Other Interview Reviews for Amazon

  1. Helpful (19)  

    Data Scientist Interview

    Anonymous Interview Candidate in Seattle, WA
    No Offer
    Negative Experience
    Easy Interview

    Application

    I applied through a recruiter. The process took a week. I interviewed at Amazon (Seattle, WA) in October 2016.

    Interview

    A recruiter saw my resume on Linkedin and they contact me. They sent over SQL and Probability Assessment Test to complete . The recruiter told me they won't ask me questions on SQL and Probability if you complete the assessment Test. When the interview process started I told the interviewer that I completed the Assessment Test so am not expecting any questions from SQL and Probability. Unfortunately the interviewer did not listen and the entire interview questions was on SQL and Probability. No questions on Data Science which I prepared for. I was very disappointed in the process. After 48 hours the recruiter sent an email saying they even though I did well in the interview they decided to proceed with other candidates. I could have even spent all my time on SQL and Probability if I knew thats what they were going to do, I smell something bad with the interview process.

    Interview Questions

    • They asked probability question:

      1) The probability that item an item at location A is 0.6 , and 0.8 at location B. What is the probability that item would be found on Amazon website.

      2). I have table 1, with 1million records, with ID, AGE (column names) , Table 2 with 100 records with ID and Salary then the interviewer gave me the following SQL script
      SELECT A.ID,A.AGE,B.SALARY
      FROM TABLE 1 A
      LEFT JOIN
      TABLE 2 B
      ON A.ID = B.ID
      +
      WHERE B.SALARY > 50000 ( HE ASKED TO MODIFY THIS LINE OF QUERY)

      How many records would be returned?

      3. Give a csv file with ID, and Quantity columns, 50million records and size of data is 2gig, write a program in any language of your choice to aggregate the QUANTITY column.   5 Answers

  2. Helpful (7)  

    Data Scientist Interview

    Anonymous Interview Candidate in Telephone, TX
    No Offer
    Negative Experience
    Average Interview

    Application

    I applied online. The process took a week. I interviewed at Amazon (Telephone, TX) in February 2017.

    Interview

    Made contact with HR, several days later had telephone technical interview. They were clearly wanting a Software Engineer instead of a Data Scientist since my interviewer knew very little about Statistics or data science and only asked me CS questions. My interviewer also spent about 10 minutes discussing politics, which made me very uncomfortable.

    Interview Questions

    • Write a Python function that displays the first n Fibonacci numbers.   1 Answer
  3. Helpful (11)  

    Data Scientist Interview

    Anonymous Employee in Boston, MA
    Accepted Offer
    Positive Experience
    Average Interview

    Application

    I applied through an employee referral. The process took 4 weeks. I interviewed at Amazon (Boston, MA) in February 2017.

    Interview

    Onsite interview in the Alexa team's Boston office. Each interview is held by 2 persons: the manager and the less senior person. They are really nice and patient in asking questions. Half of the content is about the Amazon's leadership principle questions, and the other half about basic concepts in stats, data modeling and coding. It was more like a technical conversation than an interview.

    Interview Questions

    • Tell me a time when you did not agree with your advisor.   Answer Question

  4.  

    Data Scientist Interview

    Anonymous Interview Candidate in Seattle, WA
    No Offer
    Neutral Experience
    Average Interview

    Application

    I applied online. The process took 2 weeks. I interviewed at Amazon (Seattle, WA) in January 2017.

    Interview

    Contacted about setting up technical interview regarding data science modeling. Recruiter stated collabedit would be used for the interview, however it was not. The interviewer asked a few questions about my background, then a few case questions related to time series modeling. It was of average difficultly and overall I thought everything went fine, however I was not invited for a second interview so I must have made more mistakes than I realized.

    Interview Questions


  5. Helpful (2)  

    Data Scientist Interview

    Anonymous Interview Candidate
    No Offer
    Positive Experience
    Difficult Interview

    Interview

    2 phone interviews and 1 onsite interview and the onsite interview includes 5 small interviews with different people. Called out of the blue, asked if I'd be interested in interviewing. Still not entirely sure how they got my name. Had first phone interview the next week, asked no personal questions, all technical in nature. Total of 3 phone interviews and an in-person trip out to Seattle.

    Interview Questions


  6. Helpful (1)  

    Data Scientist Interview

    Anonymous Interview Candidate in New York, NY
    No Offer
    Neutral Experience
    Average Interview

    Application

    I applied through an employee referral. I interviewed at Amazon (New York, NY) in March 2017.

    Interview

    Initial phone screen of 45 minutes going over your resume / background. Describe the company and the team and asked you to complete 3 coding assignments using languages of your choosing during the interview.

    Interview Questions


  7. Helpful (3)  

    Data Scientist Interview

    Anonymous Interview Candidate in Seattle, WA
    No Offer
    Positive Experience
    Easy Interview

    Application

    I applied online. The process took 3 weeks. I interviewed at Amazon (Seattle, WA) in April 2017.

    Interview

    3 SQL questions + statistics questions + machine learning questions. Questions about my job: explain with details about my work -what, how and why. First part: gave me 3 sql questions to solve, two were easy and one was more difficult (around 5-7 minutes to solve each). Second part: Ask me a lot of things about my current job (details: what, how and why I did), statistics and machine learning questions. Gave me some case-scenarios and ask me tech questions.

    Interview Questions

    • 1. Cumulative sum of top 10 most profitable products of the last 6 month for customers in Seattle.
      2. Assumptions about logistic and linear regression
      3. Explain colinearity
      4. Step by Step of a machine learning algorithms   1 Answer
  8. Helpful (2)  

    Data Scientist Interview

    Anonymous Interview Candidate in New York, NY
    No Offer
    Positive Experience
    Difficult Interview

    Application

    I applied online. The process took 4 weeks. I interviewed at Amazon (New York, NY) in April 2017.

    Interview

    fist round general interview with hr, second round with a member in the team, live coding, I was asked some coding questions in data structure and algorithms, and some deep learning question

    Interview Questions


  9. Helpful (13)  

    Data Scientist Interview

    Anonymous Interview Candidate in New York, NY
    No Offer
    Negative Experience
    Average Interview

    Application

    I applied through an employee referral. I interviewed at Amazon (New York, NY) in September 2017.

    Interview

    First interviewer cancelled interview 15 mins AFTER the original scheduled time. Pushed to next week, but the job description is gone. HR called to explain saying that I need to get rematch to a different team if I pass the interviews.
    Second interviewer asked some basic machine learning questions without going deep into anything. Then ask me a very ambiguous question about how to predict products that can be sold next month. Then coding question.

    Interview Questions

    • Coding: Given a bar plot and imagine you are pouring water from the top, how to qualify how much water can be kept in the bar chart.   Answer Question

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