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Updated weekly · Last refresh Nov 11

Roku Frontend Engineer Interview Questions

The questions to prepare for a Roku Frontend Engineer interview. Questions from real interview reports rank first. Updated daily.

23questions
~5htotal time
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1
CodingStart here. 11 questions · ~156 min
Valid Parenthesis String with WildcardMedium
Practice

Determine whether parentheses and wildcard characters can form a valid sequence using greedy lower and upper balance bounds.

Data StructuresAlgorithmsedge casesRoku
Closures and Practical UseMedium
Practice

Use a closure with nonlocal state to process add and read operations on a running total.

CodingjavascriptabstractionRoku
Optimize Show Filtering ComplexityMedium
Practice

Optimize Roku show filtering by removing deep cloning, reusing normalized input, and avoiding unnecessary genre scans.

space complexityclean codetime complexityRoku
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2
System Design7 questions · ~99 min
Scaling a React TableHard

Build a deletable, filterable React table and explain how its architecture scales to 1 million users.

latencyclient-sidereactRoku
Instagram Image Upload and Feed InfrastructureHard

Design Instagram image upload, delivery, feed ranking, celebrity event fanout, notifications, and feed updates at scale.

ML Rankingdistributed systemsnotification systemRoku
Scale Instagram-Style System to 1 Million UsersHard

Design an ML serving architecture that can support 1 million users with predictable latency, availability, and cost.

latencydistributed systemsml inferenceRoku
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3
Behavioral & Leadership3 questions · ~43 min
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4
More topics2 questions · ~28 min
Cross-Browser Compatibility at ScaleHard

Explain how you identify, prioritize, test, and resolve cross-browser compatibility issues in a large-scale frontend project.

automated testingCI/CDcross-platformRoku
Event Delegation and High-Frequency EventsMedium

Tests understanding of DOM event model and performance best practices.

performanceRoku
The finish line: interview-readyComplete all 23 questions to finish this plan.