Roku Interview Questions
Practice the exact questions companies are asking right now.
Measure Speaker's Impact Using Propensity Score Matching
Causal Impact of Optional Device Ownership on Engagement (Observational Design) Scenario A new, optional smart speaker is released. Some users purchas...
Describe Aligning Goals with Cross-Functional Teams
Behavioral: Cross-Functional Collaboration (Data Scientist Phone Screen) Context You are interviewing for a Data Scientist role where you partner with...
Analyze Profit Decline: Data Collection and Hypothesis Testing
Coffee Shop Profit Drop Diagnostics Scenario You manage a coffee shop and notice profits have declined over a recent period. Task Outline a systematic...
Explain Bias-Variance Trade-off Simply for Stakeholders
Scenario You are in a technical phone screen for a Data Scientist role. The interviewer asks you to communicate a core modeling concept in plain langu...
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 ...
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...
Explain and quantify bias-variance tradeoff
Bias–Variance Tradeoff: Intuition, Derivation, and Practical Tuning Task Explain the bias–variance tradeoff at two levels and connect it to model tuni...
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...
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...