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Roku Interview Questions — 14 Questions

Roku

14 problems across 5 categories

Done	Title	Difficulty	Updated
	Implement ad filtering and concurrent cache Backend EngineerCoding	Medium	Feb 25, 2026
	Explain concurrency and distributed fundamentals Backend EngineerCoding	Medium	Feb 25, 2026
	Design a high-throughput ad exchange Backend EngineerSystem Design	Medium	Feb 25, 2026
	Design a video-on-demand streaming service Software EngineerSystem Design	Medium	Jan 8, 2026
	Compute longest common subsequence length Software EngineerCoding	Medium	Jan 8, 2026
	Write SQL for profit, growth, retention Data Scientist	Medium	Oct 13, 2025
	Demonstrate cross-functional collaboration and influence Data ScientistBehavioral	Medium	Oct 13, 2025
	Explain and quantify bias-variance tradeoff Data Scientist	Medium	Oct 13, 2025
	Measure speaker impact without A/B testing Data ScientistProduct Sense	Medium	Oct 13, 2025
	Diagnose coffee-shop profit decline Data ScientistProduct Sense	Medium	Oct 13, 2025
	Measure Speaker's Impact Using Propensity Score Matching Data ScientistProduct Sense	Medium	Jul 12, 2025
	Explain Bias-Variance Trade-off Simply for Stakeholders Data Scientist	Easy	Jul 12, 2025
	Describe Aligning Goals with Cross-Functional Teams Data ScientistBehavioral	Medium	Jul 12, 2025
	Analyze Profit Decline: Data Collection and Hypothesis Testing Data ScientistProduct Sense	Medium	Jul 12, 2025