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Caching System Design Case Studies

InterviewSkool tracks 37 Caching case studies with architecture diagrams, scale estimates, and deep dives.

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Companies

Topics

Distributed Systems 90Real-time 51Storage 43Data Pipelines 42API Design 41Databases 38Caching 37Security 32AI / ML 23Algorithms 20Scheduling 20Search 19Event Driven 14Fintech 14Payments 11Geospatial 11Analytics 11Observability 11E-commerce 11Messaging 10CDN 9Concurrency 8Ads 8Frontend 8Booking System 6Networking 5IoT 4Media 3Media Streaming 3Collaboration 3Rate Limiting 2
CachingClear all
Access Control System (RBAC + Resource Permissions)
6 min readSecurityDatabasesAPI Design
Intermediate▶ Mock
Ad Frequency Capping Service (Netflix Ads)
7 min readAdsReal-timeCaching
Advanced▶ Mock
Ads Audience Targeting System
5 min readAdsData PipelinesCaching
Advanced▶ Mock
Android MVVM Architecture for API-Driven Screens
4 min readFrontendAPI DesignCaching
Intermediate▶ Mock
Cloud Console Home Page (Backend-for-Frontend)
4 min readFrontendAPI DesignCaching
Intermediate▶ Mock
Color Suggestion System (Adobe)
4 min readAI / MLAPI DesignCaching
Intermediate▶ Mock
Credit Card Customer Portal
5 min readFintechSecurityAPI Design
Beginner▶ Mock
Daily Puzzle Platform (Wordle-style)
3 min readAPI DesignCachingDatabases
Beginner▶ Mock
Inventory Serving on Spinning Disks with Little RAM
5 min readStorageDatabasesAlgorithms
Advanced▶ Mock
Distributed Cache and the Hot Key / Cache Stampede Problem
6 min readCachingDistributed SystemsDatabases
Intermediate▶ Mock
E-commerce Shopping Website (and Fixing Cart Latency)
5 min readE-commerceCachingDatabases
Intermediate▶ Mock
Faceted Product Search at Large Scale (Amazon)
4 min readSearchE-commerceDistributed Systems
Intermediate▶ Mock
Flight Search Platform (Google Flights / Kayak)
4 min readSearchCachingData Pipelines
Advanced▶ Mock
Governed Data Service for Downstream Consumers
3 min readAPI DesignData PipelinesSecurity
Intermediate▶ Mock
Low-Latency Holiday Lookup Service
4 min readCachingAPI DesignFintech
Beginner▶ Mock
Streaming Homepage Rows with Viewport Loading and Deduplication (Netflix)
4 min readFrontendAPI DesignCaching
Intermediate▶ Mock
Fast Host Listings Metrics Page (Airbnb)
4 min readAnalyticsDatabasesCaching
Intermediate▶ Mock
Scalable Likes System and Like Counter
5 min readDistributed SystemsCachingDatabases
Intermediate▶ Mock
Malicious IP and URL Detection Service
5 min readSecurityReal-timeCaching
Advanced▶ Mock
Personal Finance Dashboard from Multiple Providers
3 min readFintechAPI DesignCaching
Intermediate▶ Mock
News Aggregator (Google News)
6 min readSearchData PipelinesCaching
Intermediate▶ Mock
Online Bookstore with Price Aggregation
7 min readE-commerceAPI DesignCaching
Intermediate▶ Mock
Optimizing Slow Queries on a Million-Row Table
3 min readDatabasesCaching
Beginner▶ Mock
Pastebin (Share Text by Link)
4 min readStorageCachingAPI Design
Beginner▶ Mock
"Played by Your Friends" Social Summary (Roblox)
3 min readDistributed SystemsCachingReal-time
Intermediate▶ Mock
Post Privacy and Visibility System (Facebook-style)
4 min readSecurityDistributed SystemsCaching
Advanced▶ Mock
E-commerce Product Catalog and Price Updates
6 min readE-commerceCachingDatabases
Intermediate▶ Mock
Explaining Your Own Project Architecture (and Scaling It Up)
5 min readDistributed SystemsDatabasesCaching
Beginner▶ Mock
Proximity Search (Yelp / Nearby Restaurants)
7 min readGeospatialSearchCaching
Intermediate▶ Mock
Publisher Configuration Rules and Safe Global Rollout
5 min readAdsDistributed SystemsCaching
Intermediate▶ Mock
Global Restaurant Chain Menu Update System
4 min readDistributed SystemsCDNCaching
Intermediate▶ Mock
Scaling a Rules Engine for High Traffic (Rippling)
3 min readDistributed SystemsAlgorithmsEvent Driven
Advanced▶ Mock
Runtime Localization System (i18n)
4 min readFrontendAPI DesignCDN
Intermediate▶ Mock
Aggregator Service over Many Downstream Microservices
3 min readDistributed SystemsAPI DesignCaching
Intermediate▶ Mock
To-Do List Service (REST API and Real-Time Shared Lists)
5 min readAPI DesignReal-timeCollaboration
Beginner▶ Mock
Typeahead / Search Autocomplete
6 min readSearchCachingData Pipelines
Intermediate▶ Mock
URL Shortener (TinyURL / bit.ly)
7 min readDistributed SystemsCachingStorage
Beginner+4▶ Mock

Frequently Asked Questions

What is Caching in system design?

Caching is a core system design topic covered in 37 case studies on InterviewSkool. It appears frequently in FAANG interviews, especially at Google, Amazon, and Meta.

How should I prepare Caching for system design interviews?

Study the case studies above, focusing on architecture trade-offs, scale estimates, and API designs. Practice explaining your decisions aloud — this is exactly what interviewers evaluate.

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