Pinterest Data Scientist Interview Questions

Preparing for Pinterest Data Scientist interview questions demands focused interview preparation across coding, product thinking, and experimentation. Pinterest’s DS loop typically blends practical SQL and Python problem-solving with statistical reasoning and product-metric case work, so expect questions that test your ability to extract and manipulate data, design and evaluate experiments, and translate analyses into product recommendations. ([interviewquery.com](https://www.interviewquery.com/interview-guides/Pinterest-Data-Scientist?utm_source=openai)) The process usually starts with a recruiter screen, moves to a technical phone or take-home assessment, and—if advanced—an onsite loop of domain, coding/SQL, statistics, and behavioral interviews; intern/new‑grad tracks sometimes use CodeSignal for initial screening. To prepare, rehearse live SQL and Python problems, review experiment design and key metrics, and craft concise project stories that show impact and tradeoffs. Practicing timed coding on collaborative pads and walking interviewers through your reasoning will be especially valuable. ([pinterestcareers.com](https://www.pinterestcareers.com/interviewing/?utm_source=openai)

67 Questions 1 Company06.14.2026
Showing 20 results
Role
Pinterest logo
Pinterest
Hard
Data Scientist

Estimate billboard reach and impressions

Digital Billboard: Weekly Reach, Impressions, and Store-Visit Attribution Context You are estimating the performance of a single digital billboard bes...

Statistics & Math
11
0
152 people solved
Oct 13, 2025
Pinterest logo
Pinterest
Medium
Data Scientist

Estimate Highway Billboard Impressions Using Traffic Data

Estimating Highway Billboard Reach and Impressions An out-of-home advertising team wants to estimate reach and impressions for a single highway billbo...

Statistics & Math
31
0
142 people solved
Jul 12, 2025
Pinterest logo
Pinterest
Hard
Data Scientist

Verify Machine-Learning Fundamentals for E-commerce Recommendation Platform

Verify Machine-Learning Fundamentals for E-commerce Recommendation Platform Rapid ML Fundamentals Check — Recommender Systems Context You are intervie...

Machine Learning
10
0
66 people solved
Aug 4, 2025
Pinterest logo
Pinterest
Easy
Data Scientist

Write SQL for top categories and highly active users

You are given three tables: 1) impression Event-level table of user impressions. - impression_id BIGINT (PK) - user_id BIGINT (FK → user.user_id) - pi...

Data Manipulation (SQL/Python)
58
0
389 people solved
Dec 5, 2025
Pinterest logo
Pinterest
Hard
Data Scientist

Investigate Homepage Experiment Without Control Group: Methods and Metrics

Homepage Experiment Without a Control Group A social-media homepage team is analyzing a personalized feed. An intern accidentally launched a treatment...

Analytics & Experimentation
108
0
245 people solved
Jul 12, 2025
Pinterest logo
Pinterest
Medium
Data Scientist

Evaluate New Feed-Ranking Algorithm with A/B Testing

A/B Test a New Feed-Ranking Algorithm A social-media company wants to evaluate a new feed-ranking algorithm intended to increase daily active minutes ...

Analytics & Experimentation
84
0
299 people solved
Jul 12, 2025
Pinterest logo
Pinterest
Medium
Data Scientist

Design and assess a video-pin increase experiment

Question Pinterest wants to increase the share of video pins surfaced in the Home Feed (e.g., raising video share from a ~30% baseline toward a 45% ta...

Analytics & Experimentation
10
0
169 people solved
Oct 13, 2025
Pinterest logo
Pinterest
Hard
Data Scientist

Analyze a geo rollout and interpret charts

Causal Impact of a New Onboarding Flow Launched in Texas and Florida Context: A new onboarding flow was launched on 2025-07-15 only in Texas (TX) and ...

Analytics & Experimentation
19
0
127 people solved
Oct 13, 2025
Pinterest logo
Pinterest
Hard
Data Scientist

Design metrics and experiment for Shopping launch

Experiment and Metric Plan: New Shopping Module Embedded in the Pins Feed Context You are introducing a Shopping module directly into the Pins feed. T...

Analytics & Experimentation
10
0
140 people solved
Oct 13, 2025
Pinterest logo
Pinterest
Medium
Data Scientist

Design and Evaluate a Home Carousel

Pinterest is considering adding a horizontally scrollable carousel at the top of the Home feed, similar to Instagram Stories. The carousel may surface...

Analytics & Experimentation
7
0
119 people solved
Jan 14, 2026
Pinterest logo
Pinterest
Hard
Data Scientist

Explain your ML project end-to-end

End-to-End ML Project Deep Dive (7 Parts) Assume you are describing the most complex ML project on your resume. Answer each part precisely and concret...

Machine Learning
5
0
70 people solved
Oct 13, 2025
Pinterest logo
Pinterest
Medium
Data Scientist

Optimize Hyper-parameter Search to Prevent Combinatorial Explosion

Enumerating Grid Search and Avoiding Hyperparameter Explosion You are building a hyperparameter optimization service that must enumerate every grid-se...

Machine Learning
27
0
65 people solved
Jul 12, 2025
Pinterest logo
Pinterest
Medium
Data Scientist

Determine Appropriate Statistical Test for Comparing Means

Statistical Test for Comparing Mean Active Minutes You have two weeks of experiment data for a new algorithm. The primary metric is user active minute...

Statistics & Math
82
0
325 people solved
Jul 12, 2025
Pinterest logo
Pinterest
Medium
Data Scientist

Find top video category by average time

You are given a pandas DataFrame 'pins' with columns [pin_id:int, category_id:int, time_spent_sec:float, pin_format:string] and a dict 'category_map' ...

Data Manipulation (SQL/Python)
1
0
6 people solved
Oct 13, 2025
Pinterest logo
Pinterest
Easy
Data Scientist Locked

Implement np.random.choice

This question evaluates understanding of random sampling algorithms, probability distributions (uniform and weighted), handling of weights and edge-ca...

Coding & Algorithms
5
0
47 people solved
Feb 1, 2026
Pinterest logo
Pinterest
Medium
Data ScientistSenior+

Write Queries for Pinterest Engagement Tasks

You are given several data-manipulation tasks based on Pinterest-style product data. Use UTC for all timestamp-to-date conversions unless stated other...

Data Manipulation (SQL/Python)
3
0
23 people solved
Jan 22, 2026
Pinterest logo
Pinterest
Medium
Data Scientist

Design Data Structure for Sparse Matrices Operations

Scenario Analytics engine stores extremely sparse numeric matrices. Question Design a data structure to store two sparse matrices and implement print(...

Coding & Algorithms
8
0
12 people solved
Jul 12, 2025
Pinterest logo
Pinterest
Medium
Data Scientist

Determine Pin Connections Through Common Boards

Scenario Pinterest boards contain many pins; need to infer relationships between pins. Question Given the membership lists of all boards, write a func...

Coding & Algorithms
19
0
58 people solved
Jul 12, 2025
Pinterest logo
Pinterest
Medium
Data Scientist

Design Algorithm to Minimize Payments in Expense-Sharing App

Scenario Expense-sharing app needs to settle debts among friends after a trip. Question Given a list of transactions (payer, payee, amount), design an...

Coding & Algorithms
28
0
96 people solved
Jul 12, 2025
Pinterest logo
Pinterest
Medium
Data Scientist

Analyze Global Engagement and Impressions with SQL Queries

impressions +---------+---------+----------+----------------+ | user_id | country | category | impression_cnt | +---------+---------+----------+------...

Data Manipulation (SQL/Python)
45
0
7 people solved
Jul 12, 2025

Frequently Asked Questions

How difficult are Pinterest Data Scientist interview questions?
Pinterest Data Scientist interview questions are typically perceived as moderately to highly challenging because interviews evaluate both coding fluency and applied analytical judgement. Expect timed coding or SQL problems that test data structures, algorithmic thinking, and practical data-wrangling, plus an analytics or product case that examines metric framing and experiment logic. Interviewers often probe statistical intuition and modeling trade-offs rather than only textbook theory, so difficulty comes from integrating product sense with technical correctness under time pressure. Candidates who practice end-to-end problem solving and clear communication usually perform best.
What is the typical interview process and where do Data Scientist topics appear in the loop?
The typical process begins with a recruiter screen, followed by a technical phone screen and then an onsite or virtual interview loop. Data science topics appear across multiple stages: coding and algorithmic questions (Python/R) and SQL often appear in the phone or technical screen; a longer analytical or product case appears in the onsite loop to assess metrics, experimentation, and business impact; and a specialty round (statistics, machine learning, or forecasting) probes deeper domain expertise. Behavioral and hiring-manager conversations evaluate collaboration and ownership throughout the process. Variations exist for internships and new-grad roles.
How long should I prepare for Pinterest Data Scientist interviews and what timeline is realistic?
A realistic preparation timeline is four to eight weeks, depending on your starting point and availability. In the first two weeks focus on sharpening Python and SQL fundamentals with timed practice problems. Weeks three and four should target statistics, experiment design, and applied modeling, with case-style practice that ties metrics to business decisions. The last one to two weeks are best for mock interviews, end-to-end analytics problems, and refining behavioral stories that demonstrate impact and learning. If you have less time, prioritize SQL, one coding language, and a few product-case rehearsals to maximize returns.
What are the key subtopics I should master for Pinterest Data Scientist interviews?
Key subtopics include SQL (joins, aggregations, window functions, filtering versus HAVING, and performance considerations), Python data manipulation (pandas, data structures, edge-case handling), statistics and experimental design (hypothesis testing, confidence intervals, power, bias, and causal inference), applied machine learning (model selection, feature engineering, evaluation metrics, and trade-offs), and product analytics (metric definition, funnel and segmentation analysis, diagnosing metric shifts). Additionally, be prepared to explain assumptions, clarify requirements, and connect technical outputs to product impact during case questions.
What standout tips will help me during interviews and what common pitfalls should I avoid?
Standout tips include always clarifying the problem and constraints, narrating your thought process, and tying analyses back to product or business impact. For coding and SQL, write clear, testable solutions and handle edge cases; for cases, frame hypotheses, choose meaningful metrics, and explain trade-offs in model or experiment design. Common pitfalls are rushing to a solution without asking clarifying questions, ignoring practical constraints like data availability, overfitting technical minutiae while missing product impact, and weakly quantified outcomes in behavioral stories. Practicing mock interviews and explicit metric-driven storytelling will reduce these errors.

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