System design

Netflix System Design Questions

Every system design problem candidates reported at Netflix between September 2025 and September 2026, most-asked first. Each one links to a full solution. Tick them off as you go.

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9problems
20candidate reports
3asked more than once
14topics
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Companies

Meta26Microsoft24Amazon23OpenAI22Google20TikTok16Salesforce15Anthropic15Uber12LinkedIn11Apple11JPMorgan11Atlassian11Snowflake9Netflix9Oracle9Goldman Sachs8Rippling8Databricks7Walmart7Airbnb7Capital One7NVIDIA6Pinterest6Roblox6Flipkart4Bloomberg4Visa4Adobe4Anduril1

Topics

Design a Distributed Frequency-Capping Service
8 reports · last seen Aug 2026AdsReal-timeCaching
Advanced▶ Mock
Model ads demand data for reporting
4 reports · last seen Feb 2026AdsDatabasesAnalytics
Intermediate▶ Mock
Design Publisher Configuration Rules
2 reports · last seen Apr 2026AdsDistributed SystemsCaching
Intermediate▶ Mock
Design a Scheduler for ML Training and Batch Inference Jobs
1 report · last seen Jun 2026SchedulingDistributed SystemsEvent Driven
Advanced+7▶ Mock
Design a File Backup System
1 report · last seen Apr 2026StorageCDNDistributed Systems
Advanced▶ Mock
Design an Ad Pacing System
1 report · last seen Apr 2026AdsReal-timeDistributed Systems
Advanced▶ Mock
Design homepage viewport rendering with deduplication
1 report · last seen Mar 2026FrontendAPI DesignCaching
Intermediate▶ Mock
Design an ads audience targeting system
1 report · last seen Jan 2026AdsData PipelinesCaching
Advanced▶ Mock
Design config rollout and click aggregation
1 report · last seen Dec 2025AdsAnalyticsData Pipelines
Advanced+2▶ Mock

Duplicate reports of the same problem are merged and counted.

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Frequently Asked Questions

What system design questions does Netflix ask?

Candidates reported 9 distinct system design problems at Netflix between September 2025 and September 2026, including Design a Distributed Frequency-Capping Service, Model ads demand data for reporting, Design Publisher Configuration Rules.

How to prepare for Netflix system design interview?

Start with the Netflix problems reported most often, work through each full solution, then practice explaining a design end to end under time pressure in a mock interview.

What is the difference between HLD and LLD at Netflix?

HLD (High-Level Design) focuses on system architecture, scalability, and component interactions. LLD (Low-Level Design) dives into class diagrams, API contracts, and database schemas. Netflix tests both.