Serious SDE2/Senior prep across core and advanced systems.

System Design Sheet

Arch 50

Serious SDE2/Senior prep: Arch25 plus deeper infra, data, reliability, and advanced product systems.

Overall progress

0/50 solved

0%

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easy0/7

medium0/25

hard0/18

0/50

Solved

CategoryCompanyDifficultyStatus

Web Services

0/1 solved

Status	Star	Problem	Difficulty	Notes
		Design a URL Shortener (TinyURL / Bit.ly) Asked by:GoogleMetaAmazon+3 more	easy

Infrastructure

0/16 solved

Status	Star	Problem	Difficulty	Notes
		Design an API Rate Limiter Asked by:StripeGoogleAmazon+3 more	easy
		Design a Unique ID Generator (Twitter Snowflake) Asked by:TwitterMetaMicrosoft+1 more	easy
		Design a Notification System (Push, Email, SMS) Asked by:AppleMetaAmazon+2 more	easy
		Design a Load Balancer Asked by:GoogleAWSMicrosoft+2 more	easy
		Design a Content Delivery Network (CDN) Asked by:NetflixCloudflareAmazon+1 more	medium
		Design a Distributed Cache (Redis / Memcached) Asked by:TwitterMetaRedisLabs+1 more	medium
		Design a Distributed Job Scheduler (Quartz / Airflow) Asked by:GoogleNetflixAirbnb+1 more	medium
		Design a Distributed Lock Manager Asked by:UberGoogleAmazon+1 more	medium
		Design a Distributed Worker Queue (RabbitMQ / SQS) Asked by:AmazonMicrosoftUber+1 more	medium
		Design a Distributed Message Broker (Kafka-style) Asked by:LinkedInConfluentUber+1 more	medium
		Design an Event Sourcing System Asked by:StripeSquareUber+1 more	medium
		Design a Circuit Breaker Asked by:NetflixMicrosoftGoogle+1 more	medium
		Design a Service Discovery System Asked by:HashiCorpNetflixAWS+1 more	medium
		Design a Distributed Consensus System (Raft / Paxos) Asked by:GoogleCoreOSHashiCorp+1 more	hard
		Design a Workflow Orchestration Engine (like Temporal/Cadence) Asked by:TemporalUberNetflix+1 more	hard
		Design an API Gateway (Kong / Envoy) Asked by:KongStripeNetflix+1 more	hard

Storage

0/5 solved

Status	Star	Problem	Difficulty	Notes
		Design a Key-Value Store Asked by:AmazonGoogleMeta+1 more	medium
		Design Dropbox / Google Drive (File Storage + Sync) Asked by:DropboxGoogleMicrosoft+1 more	medium
		Design a Time-Series Database Asked by:InfluxDataDatadogPrometheus+1 more	hard
		Design a Blob Storage System (like S3) Asked by:AWSGoogleMicrosoft+1 more	hard
		Design a Relational Database (PostgreSQL) Asked by:GoogleAmazonMicrosoft+1 more	hard

Messaging

0/1 solved

Status	Star	Problem	Difficulty	Notes
		Design a Real-Time Chat Application (WhatsApp / Slack) Asked by:MetaSlackMicrosoft+1 more	medium

Search

0/2 solved

Status	Star	Problem	Difficulty	Notes
		Design Google Typeahead / Autocomplete Asked by:GoogleMicrosoftAmazon+1 more	easy
		Design a Search Engine (Google) Asked by:GoogleMicrosoftAmazon	medium

Realtime Systems

0/2 solved

Status	Star	Problem	Difficulty	Notes
		Design Google Docs (Real-Time Collaborative Editing) Asked by:GoogleMicrosoftAtlassian+1 more	hard
		Design a Video Conferencing System (like Zoom) Asked by:ZoomMicrosoftGoogle+1 more	hard

Social

0/2 solved

Status	Star	Problem	Difficulty	Notes
		Design a Timeline and Tweet Service (Twitter) Asked by:TwitterMetaLinkedIn+1 more	easy
		Design a News Feed System (Facebook / Instagram) Asked by:MetaTwitterLinkedIn+1 more	medium

Media Streaming

0/1 solved

Status	Star	Problem	Difficulty	Notes
		Design a Video Streaming Platform (YouTube / Netflix) Asked by:NetflixGoogleAmazon+1 more	medium

Commerce Marketplace

0/4 solved

Status	Star	Problem	Difficulty	Notes
		Design a Food Delivery Platform (DoorDash / Zomato) Asked by:DoorDashUberInstacart+1 more	medium
		Design an E-Commerce Platform (Amazon / Flipkart) Asked by:AmazonWalmarteBay+1 more	medium
		Design a Ticketing System (BookMyShow / TicketMaster) Asked by:TicketmasterAmazonGoogle	medium
		Design a Flash Sale System Asked by:AlibabaAmazonFlipkart+1 more	hard

Fintech Payments

0/3 solved

Status	Star	Problem	Difficulty	Notes
		Design a Payment Gateway (Handling ACID Transactions) Asked by:StripePayPalSquare+2 more	medium
		Design a Stock Exchange Matching Engine Asked by:NasdaqNYSERobinhood+2 more	hard
		Design a Distributed Banking Ledger System Asked by:StripeBlockPayPal+2 more	hard

Geo Location

0/1 solved

Status	Star	Problem	Difficulty	Notes
		Design a Ride-Hailing Service (Uber) Asked by:UberLyftGrab+2 more	medium

Data Analytics

0/4 solved

Status	Star	Problem	Difficulty	Notes
		Design a Web Crawler (Googlebot) Asked by:GoogleMicrosoftYahoo	medium
		Design Top K Rankings System (App Store / Amazon Bestsellers) Asked by:AppleAmazonGoogle+2 more	medium
		Design a Distributed Stream Processing System (Apache Flink) Asked by:NetflixUberLinkedIn+1 more	medium
		Design a Change Data Capture (CDC) Pipeline Asked by:NetflixDebeziumStripe+1 more	hard

Observability Devops

0/2 solved

Status	Star	Problem	Difficulty	Notes
		Design a Distributed Tracing System (like Jaeger / Zipkin) Asked by:UberGoogleNetflix+1 more	medium
		Design a Feature Flag System Asked by:LaunchDarklyNetflixMeta+1 more	medium

Security Trust

0/2 solved

Status	Star	Problem	Difficulty	Notes
		Design an Authentication and Authorization System (OAuth 2.0/SSO) Asked by:OktaMicrosoftGoogle+1 more	hard
		Design a Content Moderation System Asked by:MetaByteDanceGoogle+1 more	hard

Machine Learning

0/3 solved

Status	Star	Problem	Difficulty	Notes
		Design a Recommendation System (Netflix / TikTok Style) Asked by:NetflixByteDanceGoogle+1 more	hard
		Design a Fraud Detection System Asked by:StripePayPalCoinbase+2 more	hard
		Design an A/B Testing and Experimentation Platform Asked by:NetflixMetaOptimizely+1 more	hard

Ai Applied Systems

0/1 solved

Status	Star	Problem	Difficulty	Notes
		Design an LLM Chat Application (ChatGPT) Asked by:OpenAIAnthropicGoogle+1 more	hard