Roku Data Scientist Interview Questions

Practice the exact questions companies are asking right now.

9 Questions 1 Company10.13.2025
Showing 9 results
Role
Roku logo
Roku
Medium
Data Scientist

Demonstrate cross-functional collaboration and influence

Behavioral Prompt — Cross-Functional Collaboration (STAR) Provide a specific example of cross-functional collaboration with a Product Manager (PM) and...

Behavioral & Leadership
7
0
64 people solved
Oct 13, 2025
Roku logo
Roku
Easy
Data Scientist

Explain Bias-Variance Trade-off Simply for Stakeholders

Explain the Bias-Variance Trade-off Simply for Stakeholders You are in a data scientist interview and need to explain a core modeling concept to a non...

Statistics & Math
6
0
50 people solved
Jul 12, 2025
Roku logo
Roku
Medium
Data Scientist Locked

Explain and quantify bias-variance tradeoff

This question evaluates understanding of the bias–variance tradeoff, the expected test-error decomposition into irreducible noise, bias^2, and varianc...

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

Diagnose coffee-shop profit decline

You run a single-location coffee shop. In August 2025, profit dropped 18% vs July while transactions fell 4% and average check rose 2%. You have these...

Analytics & Experimentation
8
0
55 people solved
Oct 13, 2025
Roku logo
Roku
Medium
Data Scientist

Measure speaker impact without A/B testing

Your company launched an optional smart speaker on 2025-01-10. Adoption is voluntary; 6% of existing app users purchase within 60 days, and you cannot...

Analytics & Experimentation
8
0
77 people solved
Oct 13, 2025
Roku logo
Roku
Medium
Data Scientist

Describe Aligning Goals with Cross-Functional Teams

Describe Aligning Goals with Cross-Functional Teams This behavioral prompt evaluates how you collaborate with product managers, engineers, designers, ...

Behavioral & Leadership
31
0
88 people solved
Jul 12, 2025
Roku logo
Roku
Medium
Data Scientist

Measure Speaker's Impact Using Propensity Score Matching

Measure a Speaker's Impact Using Propensity Score Matching A company releases an optional smart speaker. Some users purchase and link the speaker to t...

Analytics & Experimentation
41
0
151 people solved
Jul 12, 2025
Roku logo
Roku
Medium
Data Scientist

Analyze Profit Decline: Data Collection and Hypothesis Testing

Analyze Profit Decline: Data Collection and Hypothesis Testing You manage a coffee shop whose profits have recently declined. You need to diagnose the...

Analytics & Experimentation
15
0
67 people solved
Jul 12, 2025
Roku logo
Roku
Medium
Data Scientist

Write SQL for profit, growth, retention

Write ANSI-SQL (PostgreSQL preferred) for the tasks below. Assume all timestamps are UTC and that "today" = 2025-09-01. Schema: - products(product_id ...

Data Manipulation (SQL/Python)
6
0
93 people solved
Oct 13, 2025

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