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All Design Problems

198 guided system design challenges — build on an interactive canvas, then get AI feedback.

URL Shortener

GoogleMicrosoftAmazon

Medium/Blog Platform

MediumSubstackWordPress+1

Imgur/Image Hosting

ImgurCloudinaryFlickr+1

Pastebin

GoogleAmazonMeta

Parking Lot System

AmazonGoogleMicrosoft+1

Vending Machine System

AmazonGoogleGoldman Sachs+1

Library Management System

AmazonMicrosoftIntuit+1

Chat System

MetaSlackDiscord+1

Spotify

SpotifyAppleAmazon+1

Podcast Platform

SpotifyAppleGoogle+1

Real-Time Leaderboard

Riot GamesSupercellAmazon+2

GPS Fleet Tracking

UberLyftFedEx+3

CI/CD Pipeline

GitHubGitLabCircleCI+2

Feature Flags Service

LaunchDarklySplit.ioOptimizely+2

API Gateway

AWSKongGoogle+2

Notification System

AmazonAppleGoogle+2

Rate Limiter Service

CloudflareAmazonGoogle+2

Instagram Stories

MetaInstagramSnap

LinkedIn News Feed

LinkedInMicrosoftMeta

Reddit Comment System

RedditHNStack Overflow

Tinder Matching

TinderBumbleHinge

eBay Auction System

eBayChristie'sSotheby's

SaaS Billing Platform

StripeChargebeeRecurly

Google Calendar

GoogleMicrosoftApple

Typeahead/Autocomplete

GoogleAmazonLinkedIn

Online Code Judge

LeetCodeHackerRankCodeforces

Ticket Booking System

TicketmasterBookMyShowExpedia

Hotel Booking System

Booking.comAirbnbExpedia

Proximity/Nearby Service

Food Ordering System

Uber EatsZomatoSwiggy

Photo Sharing Platform

InstagramFlickrPinterest

Twitter Direct Messages

TwitterInstagramMeta

Database Replication Lag

FacebookLinkedInShopify+1

Message Queue Backlog Growing

LinkedInUberConfluent+1

Scale from 1K to 10M Users

StripeAirbnbUber+1

Third-Party API Rate Limited

StripePlaidSquare+1

Digital Wallet System

PayPalVenmoCash App

Drug Interaction Checker

EpocratesLexicompMedscape

Online Exam System

PearsonProctorUHackerRank

Learning Management System

CourseraUdemyCanvas

In-Game Economy

RobloxValveEpic

Inventory Management System

AmazonShopifyWalmart

Returns & Refund System

AmazonZapposWalmart

Prompt Management System

OpenAIAnthropicLangChain+2

AI Gateway

OpenAIAnthropicAWS+2

Model Registry

GoogleNetflixUber+2

Data Labeling Platform

Scale AILabelboxAmazon+2

Experiment Tracking

Weights & BiasesMLflowNeptune+2

ML Monitoring

ArizeWhyLabsEvidently+2

Music Recommendation

SpotifyAppleYouTube Music+2

Job Matching Platform

LinkedInIndeedGlassdoor+2

Image Search

GooglePinterestSnap+2

Content Moderation

MetaGoogleTikTok+2

Sentiment Analysis Service

SalesforceBrandwatchSprinklr+2

AI Code Review

GitHubGitLabAnthropic+2

Anomaly Detection System

AmazonNetflixDatadog+2

Demand Forecasting

AmazonWalmartUber+2

A/B Testing Platform

GoogleNetflixOptimizely+2

Data Quality Platform

GoogleUberMonte Carlo+2

ETL Orchestrator

AirbnbUberGoogle+2

Real-Time ML Scoring

UberDoorDashStripe+2

Data Marketplace

SnowflakeAWSDatabricks+2

Design an AI Agent

OpenAIAnthropicCognition (Devin)+1

Design a RAG Chatbot

GleanPerplexityNotion+1

Design a Customer Support Agent

Intercom FinZendesk AIAda+1

Design a Data Analysis Agent

HexOpenAI (Code Interpreter)Snowflake Cortex+1

Design a Recruitment Screening Agent

EightfoldHireVueParadox+1

Design an E-commerce Recommendation Agent

Amazon RufusFlipkart NovaShopify Sidekick+1

LLM Gateway

PortkeyHeliconeLiteLLM+2

AI Meeting Summarizer

Otter.aiFirefliesZoom+2

Enterprise API Platform

StripeTwilioPlaid+2

Cost-Optimized Startup Architecture

StartupAWSVercel+2

Elevator System

GoogleMicrosoftApple+1

News Feed Aggregator

AppleGoogleTwitter+2

File Sharing Service

DropboxGoogleWeTransfer+2

Comment System

MetaRedditDisqus+2

Social Media Analytics Dashboard

MetaSprinklrHootsuite+2

Coupon & Voucher System

AmazonShopifyStripe+2

Calendar Sync Service

GoogleMicrosoftApple+2

Webhook Delivery System

StripeGitHubShopify+2

Distributed Configuration Management

NetflixMetaGoogle+2

Twitter/X Feed

MetaTwitterGoogle+1

Netflix Streaming

NetflixAmazonDisney++1

YouTube

GoogleMetaTikTok+1

Google Docs

GoogleMicrosoftNotion+1

Figma Multiplayer

FigmaAdobeCanva+1

Multiplayer Game Server

Riot GamesEpic GamesValve+2

Live Streaming Platform

TwitchYouTubeNetflix+2

Collaborative Whiteboard

FigmaMiroGoogle+2

IoT Device Management

AWSAzureGoogle+3

Virtual Events Platform

ZoomHopinMicrosoft+2

DNS System

CloudflareGoogleAWS+2

Content Delivery Network

CloudflareAkamaiAWS+2

Redis Cluster

Redis LabsAWSGoogle+2

Object Storage (S3)

AWSGoogleMicrosoft+2

Kubernetes Scheduler

GoogleAWSMicrosoft+2

Google Search

GoogleMicrosoftYandex+1

Web Crawler

GoogleAmazonMicrosoft+1

Analytics Pipeline

GoogleMetaNetflix+2

Distributed Task Scheduler

UberAirbnbNetflix+2

Clubhouse/Twitter Spaces

TwitterSpotifyDiscord+1

Snapchat

SnapMetaTikTok+1

WhatsApp Messaging

MetaWhatsAppSignal

Discord Voice Chat

DiscordZoomMicrosoft

Slack Real-Time Messaging

SlackSalesforceMicrosoft

Amazon E-Commerce

AmazonShopifyWalmart

Stripe Payments

StripePayPalSquare

Uber Rides

DoorDash Delivery

DoorDashUber EatsInstacart

Airbnb

AirbnbBooking.comVRBO

Stock Trading Platform

RobinhoodCoinbaseInteractive Brokers

Dropbox File Sync

DropboxGoogleMicrosoft

Google Maps

GoogleUberApple

Zoom Video Conferencing

ZoomMetaMicrosoft

Gmail Email System

GoogleYahooMicrosoft

Distributed Key-Value Store

AmazonMetaNetflix

Distributed File System

GoogleMetaAmazon

Dynamic/Surge Pricing

UberLyftDoorDash

Distributed Lock Manager

GoogleAmazonUber

Cloud Storage Service

AmazonGoogleMicrosoft

Black Friday: 100x Traffic Spike

AmazonShopifyWalmart+1

Cascading Failure in Microservices

NetflixAmazonUber+1

Region Failover After AWS Outage

NetflixAmazonStripe+1

Monolith to Microservices Migration

ShopifyNetflixAmazon+1

Zero-Downtime Data Migration

StripeGitHubShopify+1

Celebrity Tweet Thundering Herd

TwitterRedditMeta+1

Cryptocurrency Exchange

CoinbaseBinanceKraken

KYC/AML Pipeline

StripePlaidJumio

Double-Entry Banking Ledger

StripeSquareWise

Telemedicine Platform

TeladocAmwellDoctor On Demand

Electronic Health Records

EpicCernerAthenahealth

Virtual Classroom

ZoomGoogle ClassroomTeams

Battle Royale Matchmaking

EpicRiotActivision

Anti-Cheat System

Dynamic Pricing Engine

AmazonUberAirlines

LLM Serving Infrastructure

OpenAIAnthropicGoogle+2

RAG Pipeline

OpenAIAnthropicCohere+2

AI Code Assistant

GitHubJetBrainsGoogle+2

Chatbot Platform

IntercomDriftSalesforce+2

AI Agent Orchestrator

OpenAIAnthropicLangChain+2

Text-to-Image Service

OpenAIStability AIMidjourney+2

AI Search Engine

GoogleMicrosoftPerplexity+2

Fine-Tuning Platform

OpenAIGoogleHugging Face+2

ML Pipeline Orchestrator

GoogleNetflixAirbnb+2

GPU Cluster Manager

NVIDIAGoogleAWS+2

Real-Time Bidding AdTech

GoogleMetaThe Trade Desk+2

Product Recommendation

AmazonNetflixSpotify+2

Content Recommendation

NetflixYouTubeTikTok+2

Ad Targeting System

MetaGoogleAmazon+2

Search Ranking

GoogleMicrosoftAmazon+2

News Feed Ranking

MetaTwitterLinkedIn+2

Autonomous Driving Platform

WaymoTeslaCruise+2

Face Recognition

AppleGoogleAmazon+2

Medical Imaging AI

Google HealthSiemensGE Healthcare+2

Machine Translation

GoogleMetaDeepL+2

Speech-to-Text

GoogleOpenAIAmazon+2

Text-to-Speech

GoogleAmazonElevenLabs+2

Document Understanding

GoogleAmazonMicrosoft+2

Knowledge Graph

GoogleAmazonMicrosoft+2

Conversational AI Platform

GoogleAmazonMicrosoft+2

Personalization Engine

AmazonNetflixSpotify+2

Design a Multi-Agent System

LangGraphCrewAIAutoGen+1

Design a Travel Planning Agent

MakeMyTripBooking.comKayak+1

Design a Personal Finance Agent

Design a Code Generation Agent

Cognition (Devin)CursorGitHub Copilot Workspace+1

Design a Workflow Automation Agent

Zapiern8nMake (Integromat)+1

Design a Document Processing Agent

RampBrexInstabase+2

Design a Content Moderation Agent

TikTokMetaYouTube+2

Design a Deep Research Assistant

PerplexityOpenAI (Deep Research)Google (Gemini Deep Research)+1

Design a DevOps Incident Agent

Resolve AIClericPagerDuty AIOps+1

Design an AI Tutor

Khan Academy (Khanmigo)Duolingo MaxQuizlet Q-Chat+1

Design a Smart Home Agent

Apple (HomeKit)Amazon (Alexa)Google (Home)+1

Design a Healthcare Triage Agent

Ada HealthK HealthBabylon+1

Design a Meeting Scheduler Agent

MotionReclaimx.ai+1

ChatGPT Backend

OpenAIAnthropicGoogle+1

RAG System

OpenAIAnthropicGoogle+2

Recommendation Engine

NetflixSpotifyAmazon+2

Real-Time Fraud Detection

StripePayPalSquare+2

ML Feature Store

UberSpotifyGojek+2

AI Image Generation Platform

MidjourneyStability AIAdobe+2

Vector Database

PineconeWeaviateQdrant+2

Model Training Pipeline

GoogleMetaNetflix+2

Cloud Migration: On-Prem to AWS

Multi-Region E-Commerce Architecture

AmazonShopifyAlibaba+2

Zero-Trust Enterprise Architecture

GoogleMicrosoftCloudflare+2

Event-Driven Microservices: Order Processing

AmazonUberDoorDash+2

Enterprise Data Platform

NetflixAirbnbSpotify+2

Disaster Recovery: Active-Active Multi-Region

AWSNetflixStripe+2

Internal Developer Platform

SpotifyNetflixAirbnb+2

HIPAA-Compliant Healthcare SaaS

Epic SystemsCernerAthenahealth+2

Log Aggregation System

DatadogSplunkElastic+2

Distributed Rate Limiter

CloudflareAmazonGoogle+2

Permission & RBAC System

GoogleAmazonAuth0+2

Distributed Cache System

AmazonMetaNetflix+2

Event Ticketing Platform

EventbriteTicketmasterStubHub+2

Video Conferencing Infrastructure

ZoomGoogleMicrosoft+2

Content Delivery Network (CDN)

CloudflareAkamaiAmazon+2

Payment Reconciliation System

StripeSquarePayPal+2