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Roku System Design Interview: Complete Preparation Guide

Prepare for Roku's system design interview with streaming platform questions, evaluation criteria, expert tips, and a prep roadmap.

22 minUpdated Apr 25, 2026
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Interview format

4 rounds total.

System Design55 min

Design a streaming, advertising, or platform system. Roku values understanding of video delivery, ad tech, and embedded device constraints.

Coding45 min

Algorithm and data structure problem, may involve media processing, device resource optimization, or data pipeline challenges.

Technical Discussion45 min

Deep dive into past experience with streaming technology, embedded systems, or platform development.

Behavioral45 min

Culture fit interview assessing collaboration, customer focus, and passion for entertainment technology.

Commonly asked systems

Design a video streaming platform with adaptive bitrate deliveryDesign a programmatic advertising platform for connected TVDesign a content recommendation engine for streamingDesign a channel store and app distribution platformDesign a device firmware OTA update systemDesign a real-time ad insertion system for live streamsDesign a content search and discovery system across multiple streaming services

What they evaluate

Streaming & Video DeliveryHigh

Roku is a streaming-first company. Demonstrate knowledge of HLS/DASH, adaptive bitrate, transcoding, and CDN delivery for video.

Ad Tech UnderstandingHigh

Advertising is Roku's primary revenue driver. Show familiarity with programmatic ads, SSAI, ad decisioning, and measurement.

Device Constraints AwarenessMedium-High

Roku devices have limited CPU, memory, and storage. Design systems that account for resource-constrained endpoints.

Scale & ReliabilityMedium

Roku serves 80M+ active accounts. Design for high availability, especially during peak streaming hours.

Trade-off AnalysisMedium

Balance video quality against bandwidth, ad relevance against user experience, feature richness against device performance.

Tips

  • ▸Understand video streaming end-to-end: encoding, transcoding, packaging (HLS/DASH), CDN delivery, and adaptive bitrate algorithms
  • ▸Study connected TV advertising: server-side ad insertion (SSAI), VAST/VMAP protocols, ad podding, and measurement
  • ▸Know the constraints of embedded devices: limited memory, CPU, storage, and how they affect system design
  • ▸Be familiar with content recommendation systems: collaborative filtering, content-based, and hybrid approaches
  • ▸Study OTA firmware update strategies for millions of devices with rollback capabilities
  • ▸Understand how content rights and DRM (Widevine, PlayReady) affect streaming architecture
  • ▸Prepare to discuss the economics of streaming platforms: content licensing, ad-supported vs subscription models

Preparation roadmap

Week 1-2Streaming Foundations
  • ·Study video streaming: encoding, transcoding, HLS/DASH, adaptive bitrate
  • ·Learn ad tech fundamentals: programmatic advertising, SSAI, measurement
  • ·Review CDN architecture and video delivery optimization
Week 3-4Core Platform Systems
  • ·Design a video streaming platform with adaptive bitrate
  • ·Design a programmatic ad platform for connected TV
  • ·Design a content recommendation engine
Week 5-6Device & Advanced Topics
  • ·Design an OTA firmware update system for millions of devices
  • ·Design a real-time ad insertion system for live streams
  • ·Study DRM systems and content protection architectures
Week 7-8Mock Interviews & Polish
  • ·Complete 4+ mock system design interviews with streaming focus
  • ·Practice explaining video delivery pipelines clearly
  • ·Review Roku's developer documentation and platform architecture
  • ·Prepare behavioral stories about building consumer entertainment products
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