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Interview · Data Scientist

Data Scientist interview questions, with what they test.

12 questions built from what the job actually involves: its core duties, the skills rated most important and the tools in use. Switch on practice mode to rehearse before you look.

12 questions · practice mode
Updated Oct 24, 2026 · Data: O*NET 31.0
Quick answer

Data Scientist interviews test whether you can do the core work, such as analyze, manipulate, or process large sets of data using statistical…, and the skills rated most important for the role: mathematics, critical thinking and reading comprehension (O*NET). Prepare one true, specific story for each, with a result.

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Q01Walk me through how you analyze, manipulate, or process large sets of data using statistical software.Core duty
What they are really testing

Hands-on experience with one of the duties workers rate most important for data scientists, and the judgment calls inside it.

Likely follow-ups
  • How does this connect to how you identify business problems or management objectives that can be…?
  • What went wrong the last time, and what did you change?
Answer approach
  1. Step 1Where you did it, how often and for whom
  2. Step 2Your steps in order, including how you used Apache Hadoop
  3. Step 3One judgment call you made, and why
  4. Step 4The result, with a number you can defend
Q02Walk me through how you create graphs, charts, or other visualizations to convey the results of data analysis using specialized software.Core duty
What they are really testing

Hands-on experience with one of the duties workers rate most important for data scientists, and the judgment calls inside it.

Likely follow-ups
  • How does this connect to how you compare models using statistical performance metrics, such as loss…?
  • What went wrong the last time, and what did you change?
Answer approach
  1. Step 1Where you did it, how often and for whom
  2. Step 2Your steps in order, including how you used Git
  3. Step 3One judgment call you made, and why
  4. Step 4The result, with a number you can defend
Q03Walk me through how you test, validate, and reformulate models to ensure accurate prediction of outcomes of interest.Core duty
What they are really testing

Hands-on experience with one of the duties workers rate most important for data scientists, and the judgment calls inside it.

Likely follow-ups
  • How does this connect to how you clean and manipulate raw data using statistical software?
  • What went wrong the last time, and what did you change?
Answer approach
  1. Step 1Where you did it, how often and for whom
  2. Step 2Your steps in order, including how you used SAS
  3. Step 3One judgment call you made, and why
  4. Step 4The result, with a number you can defend
Q04Walk me through how you deliver oral or written presentations of the results of mathematical modeling and data analysis to management or other end users.Core duty
What they are really testing

Hands-on experience with one of the duties workers rate most important for data scientists, and the judgment calls inside it.

Likely follow-ups
  • How does this connect to how you identify solutions to business problems, such as budgeting, staffing…?
  • What went wrong the last time, and what did you change?
Answer approach
  1. Step 1Where you did it, how often and for whom
  2. Step 2Your steps in order, including how you used Snowflake
  3. Step 3One judgment call you made, and why
  4. Step 4The result, with a number you can defend
Q05Walk me through how you recommend data-driven solutions to key stakeholders.Core duty
What they are really testing

Hands-on experience with one of the duties workers rate most important for data scientists, and the judgment calls inside it.

Likely follow-ups
  • How does this connect to how you apply feature selection algorithms to models predicting outcomes of…?
  • What went wrong the last time, and what did you change?
Answer approach
  1. Step 1Where you did it, how often and for whom
  2. Step 2Your steps in order, including how you used TensorFlow
  3. Step 3One judgment call you made, and why
  4. Step 4The result, with a number you can defend
Q06Tell me about a piece of code you are proud of and why.Programming
What they are really testing

Code quality, reasoning and ownership. Programming is rated 3.8 of 5 for this job, +2.1 against the average occupation (O*NET).

Answer approach
  1. Step 1What it did
  2. Step 2A key decision
  3. Step 3How you tested it
  4. Step 4Pick the example from the core work, for instance when you had to analyze, manipulate, or process large sets of data using statistical software
Q07Walk me through a calculation you do regularly in this work, and how you check it.Mathematics
What they are really testing

Comfort with the numbers the job depends on, and accuracy habits. Mathematics is rated 4.4 of 5 for this job, +1.8 against the average occupation (O*NET).

Answer approach
  1. Step 1The calculation and why it matters
  2. Step 2How you do it
  3. Step 3How you verify it
  4. Step 4Pick the example from the core work, for instance when you had to create graphs, charts, or other visualizations to convey the results of data…
Q08Tell me about a time the obvious answer turned out to be wrong.Critical Thinking
What they are really testing

Whether you test assumptions and weigh evidence before acting. Critical Thinking is rated 4.2 of 5 for this job, +0.7 against the average occupation (O*NET).

Answer approach
  1. Step 1The situation and the obvious answer
  2. Step 2What made you doubt it
  3. Step 3How you checked
  4. Step 4Pick the example from the core work, for instance when you had to test, validate, and reformulate models to ensure accurate prediction of…
Q09Tell me how you used scientific reasoning to solve a problem at work.Science
What they are really testing

Use of evidence, hypotheses and tests rather than guesswork. Science is rated 2.5 of 5 for this job, +0.6 against the average occupation (O*NET).

Answer approach
  1. Step 1The problem
  2. Step 2Your hypothesis
  3. Step 3How you tested it
  4. Step 4Pick the example from the core work, for instance when you had to deliver oral or written presentations of the results of mathematical modeling…
Q10Walk me through the hardest problem you solved in this kind of work.Complex Problem Solving
What they are really testing

Structured thinking on problems with no single obvious answer. Complex Problem Solving is rated 3.8 of 5 for this job, +0.5 against the average occupation (O*NET).

Answer approach
  1. Step 1Why it was hard
  2. Step 2How you broke it down
  3. Step 3The options you weighed
  4. Step 4Pick the example from the core work, for instance when you had to recommend data-driven solutions to key stakeholders
Q11Which of these have you used: Apache Hadoop, Git, SAS? Tell me about a recent piece of work with one of them.Tools
What they are really testing

Real, recent use of the tools data scientists depend on, not a list of names.

Likely follow-ups
  • How would you get up to speed on Apache Cassandra if you haven't used it?
Answer approach
  1. Step 1Name the tool and the task, e.g. Apache Hadoop for analyze, manipulate, or process large sets of data using…
  2. Step 2What you did with it
  3. Step 3A problem you solved with it
  4. Step 4What the output was used for
Q12Why do you want to work as a Data Scientist?Motivation
What they are really testing

Whether you understand what the job really involves, and whether that is what you want.

Answer approach
  1. Step 1Name the part of the work you like: e.g. analyze, manipulate, or process large sets of data using…
  2. Step 2Evidence you have done it or something close
  3. Step 3Why this employer
  4. Step 4Where you want to grow

Data Duty, skill, tool and conditions questions are built from O*NET data for this occupation. Advice Answer approaches are our coaching advice.

Answer framework

Two structures that work

SSituationOne sentence of context.
TTaskWhat you owned.
AActionWhat you did, in your words.
RResultWhat changed, with a number if true.
Questions to ask them

End the interview well

Advice

  • What does a strong first 90 days look like for this data scientist role?
  • Which part of the work takes the most time in a typical week?
  • How is performance measured here?
  • What tools and systems does the team use?
FAQ

Common questions

What are common Data Scientist interview questions?
Expect questions about the core duties (analyze, manipulate, or process large sets of data using…), about mathematics and critical thinking, and about the tools you have used. This page lists 12 with what each one tests.
How should I answer behavioral questions?
Use a short structure such as Situation, Task, Action, Result, and end with a specific, true result.
Method

How this page is built

Questions are generated from O*NET 31.0 data for the occupation: its core tasks, the skills with the highest importance ratings, the tools reported, and work-context ratings. The interviewer intent and answer approach are TryHired coaching advice.

What this page can't tell you
  • What a specific employer will ask.
  • Technical tests or licensing exams for the role.
Sources
  1. O*NET 31.0 Database, U.S. Department of Labor, Employment and Training Administration (USDOL/ETA), used under the CC BY 4.0 license. TryHired selected, ranked and combined the data; O*NET is not responsible for these pages.
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