FAANG INTERVIEWS · SYSTEM DESIGN · 20 TOPICS

Master system design.
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Every system design topic as a visual pack - animated walkthroughs, cheat sheets, real interview questions, common anti-patterns, and difficulty ladders. Free.

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Timed Challenges

10-min topic sprints with score tracking and time pressure

📋

Interview Questions

Real questions tagged by company, role level, and difficulty

∑

Cheat Sheets

Fast-access references grouped by subtopic with key trade-offs

⚠

Anti-Patterns

The 10-20 design mistakes candidates make in every topic, mapped

Difficulty Ladder

Start easy. Build to FAANG level.

Level 1
Junior / Basics
Core concepts, single-service designs, basic trade-offs
Level 2
Mid-Level Interview
Multi-service architectures, standard scaling patterns
Level 3
Senior / Deep Dive
Complex distributed systems, consistency models, edge cases
Level 4
Staff+ / FAANG Hard
Planet-scale systems, novel architectures, deep trade-off analysis
Topic Packs

Pick a topic. Start building.

View all 20 →
01VERY COMMON
URL Shortener
8 Concepts10 Cheat Items
GoogleMetaAmazonMicrosoftUberStripe
02VERY COMMON
Rate Limiter
8 Concepts10 Cheat Items
GoogleMetaAmazonStripeCloudflareUber
03VERY COMMON
Twitter / News Feed
8 Concepts10 Cheat Items
GoogleMetaAmazonTwitterLinkedInNetflix
04VERY COMMON
Web Crawler
8 Concepts10 Cheat Items
GoogleAmazonMicrosoftAppleMetaLinkedIn
05VERY COMMON
YouTube / Video Streaming
8 Concepts10 Cheat Items
GoogleNetflixAmazonMetaMicrosoftApple
06COMMON
Google Drive / Dropbox
8 Concepts10 Cheat Items
GoogleDropboxMicrosoftAmazonMetaApple
07VERY COMMON
Uber / Ride Sharing
8 Concepts10 Cheat Items
UberLyftGoogleAmazonMetaMicrosoft
08VERY COMMON
Instagram / Photo Sharing
8 Concepts10 Cheat Items
MetaGoogleAmazonMicrosoftNetflixUber
09VERY COMMON
Chat System / Messenger
8 Concepts10 Cheat Items
MetaGoogleMicrosoftAmazonSlackDiscord
10VERY COMMON
Consistent Hashing / Distributed Cache
8 Concepts10 Cheat Items
AmazonGoogleMetaDiscordAkamaiUber
11COMMON
Credit Card Processing System
8 Concepts10 Cheat Items
StripeSquarePayPalAmazonGoogleAdyen
12COMMON
Distributed Database Control Plane
8 Concepts10 Cheat Items
GoogleAmazonCockroachDBMetaPlanetScaleMicrosoft
13COMMON
Music Streaming Platform
8 Concepts10 Cheat Items
SpotifyAppleAmazonYouTube MusicSoundCloudTidal
14COMMON
Google Maps / Navigation
8 Concepts10 Cheat Items
GoogleAppleUberMapboxHereWaze
15VERY COMMON
Notification System
8 Concepts10 Cheat Items
GoogleAppleAmazonMetaUberAirbnb
16COMMON
Key-Value Store
8 Concepts10 Cheat Items
AmazonGoogleMetaLinkedInNetflixDatastax
17COMMON
Unique ID Generator
8 Concepts10 Cheat Items
TwitterDiscordMetaInstagramSonyBaidu
18COMMON
Search Autocomplete
8 Concepts10 Cheat Items
GoogleAmazonLinkedInMetaUberAirbnb
19COMMON
Distributed Task Scheduler
8 Concepts10 Cheat Items
GoogleAmazonUberAirbnbNetflixSlack
20COMMON
Ad Click Aggregator
8 Concepts10 Cheat Items
GoogleMetaAmazonTikTokPinterestUber