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the-design-round

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The Design Round - Structured interview prep for system design and machine coding rounds. Curated sheets — Arch 25, Arch 50, Arch 75, Arch All, MaCo 30, Design Patterns, Core Concepts — built for senior engineering interviews.

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# System Design & Machine Coding Interview Resources

Welcome to the ultimate open-source directory for clearing software engineering interviews at FAANG and top-tier tech companies. This repository indexes hundreds of system design architecture problems, machine coding questions, design patterns, and core concepts.

## 🗺️ Interview Roadmaps
- [Software Engineering Interview Roadmap](https://thedesignround.com/software-engineering-interview-roadmap)
- [Low-Level Design (LLD) Roadmap](https://thedesignround.com/low-level-design-roadmap)
- [System Design Roadmap](https://thedesignround.com/system-design-roadmap)
- [Staff Software Engineer Roadmap](https://thedesignround.com/staff-engineer-roadmap)
- [Backend Engineer Roadmap](https://thedesignround.com/backend-engineer-roadmap)
- [Distributed Systems Roadmap](https://thedesignround.com/distributed-systems-roadmap)
- [Database Design Roadmap](https://thedesignround.com/database-design-roadmap)
- [Microservices Architecture Roadmap](https://thedesignround.com/microservices-architecture-roadmap)

## 📚 Top Problem Sheets
- [System Design Top 25 Architecture Problems](https://thedesignround.com/system-design/sheets/arch25)
- [System Design Top 50 Architecture Problems](https://thedesignround.com/system-design/sheets/arch50)
- [Machine Coding Top 30 Problems](https://thedesignround.com/machine-coding/sheets/maco30)
- [Machine Coding Top 60 Problems](https://thedesignround.com/machine-coding/sheets/maco60)

## 🧠 System Design Core Concepts
- [Back-of-the-Envelope Estimation](https://thedesignround.com/system-design/core-concepts/01-back-of-the-envelope-estimation)
- [Client-Server vs Peer-to-Peer Architecture](https://thedesignround.com/system-design/core-concepts/02-client-server-vs-peer-to-peer)
- [Network Protocols: HTTP, gRPC, WebSocket, DNS](https://thedesignround.com/system-design/core-concepts/03-network-protocols-http-grpc-websocket-dns)
- [Scaling 0 to 1M Users](https://thedesignround.com/system-design/core-concepts/04-scaling-0-to-1m-users)
- [Consistent Hashing](https://thedesignround.com/system-design/core-concepts/05-consistent-hashing)
- [SQL vs NoSQL Databases](https://thedesignround.com/system-design/core-concepts/06-sql-vs-nosql)
- [CAP Theorem & Consistency Models](https://thedesignround.com/system-design/core-concepts/07-cap-theorem-and-consistency-models)
- [Replication, Failover, & Leader Election](https://thedesignround.com/system-design/core-concepts/08-replication-failover-and-leader-election)
- [Database Sharding and Partitioning](https://thedesignround.com/system-design/core-concepts/09-sharding-and-partitioning)
- [Indexing and Query Optimization](https://thedesignround.com/system-design/core-concepts/10-indexing-and-query-optimization)
- [Distributed Transactions: 2PC vs Saga](https://thedesignround.com/system-design/core-concepts/11-distributed-transactions-2pc-vs-saga)
- [Caching Patterns and Invalidation](https://thedesignround.com/system-design/core-concepts/12-caching-patterns-and-invalidation)
- [Redis Patterns for Interview Systems](https://thedesignround.com/system-design/core-concepts/13-redis-patterns-for-interview-systems)
- [Load Balancing Algorithms](https://thedesignround.com/system-design/core-concepts/14-load-balancing-algorithms)
- [Proxy & Reverse Proxy Patterns](https://thedesignround.com/system-design/core-concepts/15-proxy-and-reverse-proxy-patterns)
- [CDN, Edge Caching, and Content Delivery](https://thedesignround.com/system-design/core-concepts/16-cdn-and-edge-delivery)
- [Message Queues Fundamentals](https://thedesignround.com/system-design/core-concepts/17-message-queues-fundamentals)
- [Kafka Architecture and Guarantees](https://thedesignround.com/system-design/core-concepts/18-kafka-architecture-and-guarantees)
- [Event Sourcing & CQRS](https://thedesignround.com/system-design/core-concepts/19-event-sourcing-and-cqrs)
- [Stream Processing Basics](https://thedesignround.com/system-design/core-concepts/20-stream-processing-basics)
- [Storage Types: Block, File, & Object](https://thedesignround.com/system-design/core-concepts/21-storage-types-block-file-object)
- [RAID & Durability Basics](https://thedesignround.com/system-design/core-concepts/22-raid-and-durability-basics)
- [Write-Ahead Logging (WAL)](https://thedesignround.com/system-design/core-concepts/23-wal-and-data-durability)
- [Distributed File Systems: GFS & HDFS](https://thedesignround.com/system-design/core-concepts/24-distributed-file-systems-gfs-hdfs)
- [Circuit Breakers, Retries, & Bulkheads](https://thedesignround.com/system-design/core-concepts/25-circuit-breaker-retries-and-bulkheads)
- [Probabilistic Data Structures](https://thedesignround.com/system-design/core-concepts/26-bloom-filter)
- [Merkle Tree](https://thedesignround.com/system-design/core-concepts/27-merkle-tree)
- [Gossip Protocol](https://thedesignround.com/system-design/core-concepts/28-gossip-protocol)
- [Observability & Distributed Tracing](https://thedesignround.com/system-design/core-concepts/29-observability-and-distributed-tracing)
- [Microservices Patterns: Strangler, Saga, & Outbox](https://thedesignround.com/system-design/core-concepts/30-microservices-patterns-strangler-saga-outbox)
- [System Design Interview Patterns](https://thedesignround.com/system-design/core-concepts/31-system-design-interview-patterns)
- [API Contract & Integration Design](https://thedesignround.com/system-design/core-concepts/32-api-contract-and-integration-design)
- [Time-Series & Metrics Storage](https://thedesignround.com/system-design/core-concepts/33-time-series-and-metrics-storage)

## 🏗️ Design Patterns (LLD)
- [Abstract Factory Pattern](https://thedesignround.com/machine-coding/design-patterns/abstractfactory)
- [Adapter Pattern](https://thedesignround.com/machine-coding/design-patterns/adapter)
- [Bridge Pattern](https://thedesignround.com/machine-coding/design-patterns/bridge)
- [Builder Pattern](https://thedesignround.com/machine-coding/design-patterns/builder)
- [Chain of Responsibility Pattern](https://thedesignround.com/machine-coding/design-patterns/chainofresponsibility)
- [Command Pattern](https://thedesignround.com/machine-coding/design-patterns/command)
- [Composite Pattern](https://thedesignround.com/machine-coding/design-patterns/composite)
- [Decorator Pattern](https://thedesignround.com/machine-coding/design-patterns/decorator)
- [Dependency Inversion Principle (DIP)](https://thedesignround.com/machine-coding/design-patterns/dependencyinversion)
- [Facade Pattern](https://thedesignround.com/machine-coding/design-patterns/facade)
- [Factory Pattern](https://thedesignround.com/machine-coding/design-patterns/factory)
- [Flyweight Pattern](https://thedesignround.com/machine-coding/design-patterns/flyweight)
- [Interface Segregation Principle (ISP)](https://thedesignround.com/machine-coding/design-patterns/interfacesegregation)
- [Interpreter Pattern](https://thedesignround.com/machine-coding/design-patterns/interpreter)
- [Iterator Pattern](https://thedesignround.com/machine-coding/design-patterns/iterator)
- [Liskov Substitution Principle (LSP)](https://thedesignround.com/machine-coding/design-patterns/liskovsubstitution)
- [Mediator Pattern](https://thedesignround.com/machine-coding/design-patterns/mediator)
- [Memento Pattern](https://thedesignround.com/machine-coding/design-patterns/memento)
- [MVC Pattern](https://thedesignround.com/machine-coding/design-patterns/mvc)
- [Null Object Pattern](https://thedesignround.com/machine-coding/design-patterns/nullobject)
- [Object Pool Pattern](https://thedesignround.com/machine-coding/design-patterns/objectpool)
- [Observer Pattern](https://thedesignround.com/machine-coding/design-patterns/observer)
- [Open Closed Principle (OCP)](https://thedesignround.com/machine-coding/design-patterns/openclosed)
- [Prototype Pattern](https://thedesignround.com/machine-coding/design-patterns/prototype)
- [Proxy Pattern](https://thedesignround.com/machine-coding/design-patterns/proxy)
- [Single Responsibility Principle (SRP)](https://thedesignround.com/machine-coding/design-patterns/singleresponsibility)
- [Singleton Pattern](https://thedesignround.com/machine-coding/design-patterns/singleton)
- [State Pattern](https://thedesignround.com/machine-coding/design-patterns/state)
- [Strategy Pattern](https://thedesignround.com/machine-coding/design-patterns/strategy)
- [Template Method Pattern](https://thedesignround.com/machine-coding/design-patterns/templatemethod)
- [Visitor Pattern](https://thedesignround.com/machine-coding/design-patterns/visitor)

## 🏗️ High-Level System Design Problems
- [Design a URL Shortener (TinyURL / Bit.ly)](https://thedesignround.com/system-design/problems/01-url-shortener)
- [Design an API Rate Limiter](https://thedesignround.com/system-design/problems/02-api-rate-limiter)
- [Design a Key-Value Store](https://thedesignround.com/system-design/problems/03-key-value-store)
- [Design a Unique ID Generator (Twitter Snowflake)](https://thedesignround.com/system-design/problems/04-unique-id-generator)
- [Design a Notification System (Push, Email, SMS)](https://thedesignround.com/system-design/problems/05-notification-system)
- [Design a News Feed System (Facebook / Instagram)](https://thedesignround.com/system-design/problems/06-news-feed-system)
- [Design a Real-Time Chat Application (WhatsApp / Slack)](https://thedesignround.com/system-design/problems/07-real-time-chat)
- [Design a Timeline and Tweet Service (Twitter)](https://thedesignround.com/system-design/problems/08-twitter-timeline)
- [Design Instagram (Photo Sharing + Social Features)](https://thedesignround.com/system-design/problems/09-instagram)
- [Design a Threaded Discussion Forum (Reddit)](https://thedesignround.com/system-design/problems/10-reddit-discussion-forum)
- [Design Google Typeahead / Autocomplete](https://thedesignround.com/system-design/problems/11-typeahead-autocomplete)
- [Design a Search Engine (Google)](https://thedesignround.com/system-design/problems/12-search-engine)
- [Design a Web Crawler (Googlebot)](https://thedesignround.com/system-design/problems/13-web-crawler)
- [Design Top K Rankings System (App Store / Amazon Bestsellers)](https://thedesignround.com/system-design/problems/14-top-k-rankings)
- [Design a Video Streaming Platform (YouTube / Netflix)](https://thedesignround.com/system-design/problems/15-video-streaming-platform)
- [Design a Distributed Stream Processing System (Apache Flink)](https://thedesignround.com/system-design/problems/16-distributed-stream-processing)
- [Design a Content Delivery Network (CDN)](https://thedesignround.com/system-design/problems/17-cdn)
- [Design a Music Streaming Service (Spotify)](https://thedesignround.com/system-design/problems/18-music-streaming)
- [Design a Ride-Hailing Service (Uber)](https://thedesignround.com/system-design/problems/19-ride-hailing-uber)
- [Design a Proximity Server (Yelp / Nearby Friends)](https://thedesignround.com/system-design/problems/20-proximity-server)
- [Design a Food Delivery Platform (DoorDash / Zomato)](https://thedesignround.com/system-design/problems/21-food-delivery)
- [Design an E-Commerce Platform (Amazon / Flipkart)](https://thedesignround.com/system-design/problems/22-ecommerce-platform)
- [Design a Ticketing System (BookMyShow / TicketMaster)](https://thedesignround.com/system-design/problems/23-ticketing-system)
- [Design a Payment Gateway (Handling ACID Transactions)](https://thedesignround.com/system-design/problems/24-payment-gateway)
- [Design Dropbox / Google Drive (File Storage + Sync)](https://thedesignround.com/system-design/problems/25-dropbox-google-drive)
- [Design Pastebin](https://thedesignround.com/system-design/problems/26-pastebin)
- [Design a Distributed Cache (Redis / Memcached)](https://thedesignround.com/system-design/problems/27-distributed-cache)
- [Design a Distributed Job Scheduler (Quartz / Airflow)](https://thedesignround.com/system-design/problems/28-distributed-job-scheduler)
- [Design a Distributed Lock Manager](https://thedesignround.com/system-design/problems/29-distributed-lock-manager)
- [Design a Load Balancer](https://thedesignround.com/system-design/problems/30-load-balancer)
- [Design a Distributed Worker Queue (RabbitMQ / SQS)](https://thedesignround.com/system-design/problems/31-distributed-worker-queue)
- [Design a Distributed Message Broker (Kafka-style)](https://thedesignround.com/system-design/problems/32-distributed-message-broker)
- [Design a Distributed Tracing System (like Jaeger / Zipkin)](https://thedesignround.com/system-design/problems/33-distributed-tracing)
- [Design an Event Sourcing System](https://thedesignround.com/system-design/problems/34-event-sourcing-system)
- [Design Live Likes & Reactions](https://thedesignround.com/system-design/problems/35-live-likes-reactions)
- [Design a Live Comments System (like Facebook Live / YouTube Live)](https://thedesignround.com/system-design/problems/36-live-comments-system)
- [Design an On-Call Escalation System (like PagerDuty / OpsGenie)](https://thedesignround.com/system-design/problems/37-oncall-escalation-system)
- [Design a User Analytics Pipeline (like Google Analytics)](https://thedesignround.com/system-design/problems/38-user-analytics-pipeline)
- [Design a Distributed Metrics Aggregation System](https://thedesignround.com/system-design/problems/39-distributed-metrics-aggregation)
- [Design a Real-time Dashboard and Metrics System](https://thedesignround.com/system-design/problems/40-realtime-dashboard-metrics)
- [Design a Log Aggregation and Search System (like Splunk / ELK)](https://thedesignround.com/system-design/problems/41-log-aggregation-search)
- [Design Like Count for High Profile Users](https://thedesignround.com/system-design/problems/42-like-count-high-profile)
- [Design a Trending Topics System](https://thedesignround.com/system-design/problems/43-trending-topics)
- [Design Top K Most Shared Articles](https://thedesignround.com/system-design/problems/44-top-k-shared-articles)
- [Design TikTok (Short Video Platform)](https://thedesignround.com/system-design/problems/45-tiktok)
- [Design Tinder (Matching System)](https://thedesignround.com/system-design/problems/46-tinder)
- [Design Quora (Q&A Platform)](https://thedesignround.com/system-design/problems/47-quora)
- [Design a Recommendation System (Netflix / TikTok Style)](https://thedesignround.com/system-design/problems/48-recommendation-system)
- [Design Ephemeral Stories (Instagram Stories)](https://thedesignround.com/system-design/problems/49-ephemeral-stories)
- [Design a User Presence System](https://thedesignround.com/system-design/problems/50-user-presence-system)
- [Design a Social Graph Store](https://thedesignround.com/system-design/problems/51-social-graph-store)
- [Design a Follower/Following System](https://thedesignround.com/system-design/problems/52-follower-following-system)
- [Design a Mentions & Tagging System](https://thedesignround.com/system-design/problems/53-mentions-tagging-system)
- [Design a Map Rendering and Navigation System like Google Maps](https://thedesignround.com/system-design/problems/54-map-rendering-navigation)
- [Design a Geofencing Service](https://thedesignround.com/system-design/problems/55-geofencing-service)
- [Design Foursquare (Check-ins and Recommendations)](https://thedesignround.com/system-design/problems/56-foursquare-checkins)
- [Design an ETA Calculation Service](https://thedesignround.com/system-design/problems/57-eta-calculation-service)
- [Design a Real-time Vehicle Tracking System](https://thedesignround.com/system-design/problems/58-realtime-vehicle-tracking)
- [Design a Bike Sharing System like Citi Bike](https://thedesignround.com/system-design/problems/59-bike-sharing-system)
- [Design a Video Transcoding Pipeline](https://thedesignround.com/system-design/problems/60-video-transcoding-pipeline)
- [Design a Live Streaming Platform like Twitch](https://thedesignround.com/system-design/problems/61-live-streaming-platform)
- [Design an Image Processing Pipeline](https://thedesignround.com/system-design/problems/62-image-processing-pipeline)
- [Design a Thumbnail Generation Service](https://thedesignround.com/system-design/problems/63-thumbnail-generation-service)
- [Design a Podcast Delivery Platform](https://thedesignround.com/system-design/problems/64-podcast-delivery-platform)
- [Design a Video Recommendation Engine](https://thedesignround.com/system-design/problems/65-video-recommendation-engine)
- [Design an Inventory Management System](https://thedesignround.com/system-design/problems/66-inventory-management-system)
- [Design a Shopping Cart System](https://thedesignround.com/system-design/problems/67-shopping-cart-system)
- [Design a Flash Sale System](https://thedesignround.com/system-design/problems/68-flash-sale-system)
- [Design an Order Management System](https://thedesignround.com/system-design/problems/69-order-management-system)
- [Design a Review and Rating System](https://thedesignround.com/system-design/problems/70-review-rating-system)
- [Design a Price Comparison Engine](https://thedesignround.com/system-design/problems/71-price-comparison-engine)
- [Design a Coupon and Discount Engine](https://thedesignround.com/system-design/problems/72-coupon-discount-engine)
- [Design a Surge Pricing System like Uber or Lyft](https://thedesignround.com/system-design/problems/73-surge-pricing-system)
- [Design a Digital Wallet System](https://thedesignround.com/system-design/problems/74-digital-wallet-system)
- [Design a Fraud Detection System](https://thedesignround.com/system-design/problems/75-fraud-detection-system)
- [Design an Authentication and Authorization System (OAuth 2.0/SSO)](https://thedesignround.com/system-design/problems/76-auth-system-oauth-sso)
- [Design a Stock Exchange Matching Engine](https://thedesignround.com/system-design/problems/77-stock-exchange-matching-engine)
- [Design a Distributed Banking Ledger System](https://thedesignround.com/system-design/problems/78-banking-ledger-system)
- [Design a Multi-Currency Payment System](https://thedesignround.com/system-design/problems/79-multi-currency-payment)
- [Design an A/B Testing and Experimentation Platform](https://thedesignround.com/system-design/problems/80-ab-testing-platform)
- [Design a Content Moderation System](https://thedesignround.com/system-design/problems/81-content-moderation-system)
- [Design Google Docs (Real-Time Collaborative Editing)](https://thedesignround.com/system-design/problems/82-google-docs-collaborative-editing)
- [Design a Video Conferencing System (like Zoom)](https://thedesignround.com/system-design/problems/83-video-conferencing-zoom)
- [Design a Distributed Consensus System (Raft / Paxos)](https://thedesignround.com/system-design/problems/84-distributed-consensus-raft-paxos)
- [Design a Circuit Breaker](https://thedesignround.com/system-design/problems/85-circuit-breaker)
- [Design a Time-Series Database](https://thedesignround.com/system-design/problems/86-time-series-database)
- [Design a Blob Storage System (like S3)](https://thedesignround.com/system-design/problems/87-blob-storage-s3)
- [Design a Service Discovery System](https://thedesignround.com/system-design/problems/88-service-discovery)
- [Design a Feature Flag System](https://thedesignround.com/system-design/problems/89-feature-flag-system)
- [Design a Real-Time Bidding System (Ad Tech)](https://thedesignround.com/system-design/problems/90-realtime-bidding-system)
- [Design a Multiplayer Game Backend](https://thedesignround.com/system-design/problems/91-multiplayer-game-backend)
- [Design a P2P File Transfer System (like BitTorrent)](https://thedesignround.com/system-design/problems/92-p2p-file-transfer-bittorrent)
- [Design an Email Service (like Gmail)](https://thedesignround.com/system-design/problems/93-email-service-gmail)
- [Design a Cryptocurrency Exchange](https://thedesignround.com/system-design/problems/94-cryptocurrency-exchange)
- [Design a Leaderboard System](https://thedesignround.com/system-design/problems/95-leaderboard-system)
- [Design a Hotel Booking System](https://thedesignround.com/system-design/problems/96-hotel-booking-system)
- [Design a Backup and Disaster Recovery System](https://thedesignround.com/system-design/problems/97-backup-disaster-recovery)
- [Design an Ad Click Prediction System](https://thedesignround.com/system-design/problems/98-ad-click-prediction)
- [Design an ML Feature Store](https://thedesignround.com/system-design/problems/99-ml-feature-store)
- [Design a Shared Calendar System (like Google Calendar)](https://thedesignround.com/system-design/problems/100-shared-calendar-system)
- [Design a Search Ranking System (Learning to Rank)](https://thedesignround.com/system-design/problems/101-search-ranking-learning-to-rank)
- [Design a Change Data Capture (CDC) Pipeline](https://thedesignround.com/system-design/problems/102-cdc-pipeline)
- [Design a Workflow Orchestration Engine (like Temporal/Cadence)](https://thedesignround.com/system-design/problems/103-workflow-orchestration-temporal)
- [Design an Online Judge System (Leetcode)](https://thedesignround.com/system-design/problems/104-online-judge-leetcode)
- [Design a Relational Database (PostgreSQL)](https://thedesignround.com/system-design/problems/105-relational-database-postgresql)
- [Design a Distributed Coordination Service (ZooKeeper)](https://thedesignround.com/system-design/problems/106-distributed-coordination-zookeeper)
- [Design a Code Hosting Platform (GitHub)](https://thedesignround.com/system-design/problems/107-code-hosting-platform-github)
- [Design an LLM Chat Application (ChatGPT)](https://thedesignround.com/system-design/problems/108-llm-chat-application-chatgpt)
- [Design an AI Coding Assistant (Cursor / Claude Code)](https://thedesignround.com/system-design/problems/109-ai-coding-assistant-cursor)
- [Design an API Gateway (Kong / Envoy)](https://thedesignround.com/system-design/problems/110-api-gateway-kong)
- [Design a Document Q&A Platform (RAG System)](https://thedesignround.com/system-design/problems/111-document-qa-platform-rag)

## 💻 Machine Coding (LLD) Problems
- [Parking Lot](https://thedesignround.com/machine-coding/problems/01-parking-lot)
- [Snake & Ladder](https://thedesignround.com/machine-coding/problems/02-snake-and-ladder)
- [Elevator System](https://thedesignround.com/machine-coding/problems/03-elevator-system)
- [Meeting Scheduler](https://thedesignround.com/machine-coding/problems/04-meeting-scheduler)
- [Splitwise](https://thedesignround.com/machine-coding/problems/05-splitwise)
- [Movie Booking (BookMyShow)](https://thedesignround.com/machine-coding/problems/06-movie-booking-bms)
- [Vending Machine](https://thedesignround.com/machine-coding/problems/07-vending-machine)
- [API Rate Limiter](https://thedesignround.com/machine-coding/problems/08-api-rate-limiter)
- [Tic-Tac-Toe](https://thedesignround.com/machine-coding/problems/09-tic-tac-toe)
- [In-Memory Key-Value Store](https://thedesignround.com/machine-coding/problems/10-in-memory-kv-store)
- [Search Ranking (Learning to Rank)](https://thedesignround.com/machine-coding/problems/100-search-ranking)
- [Log Search (ELK-style)](https://thedesignround.com/machine-coding/problems/101-log-search-elk)
- [Auth Service (OAuth / SSO)](https://thedesignround.com/machine-coding/problems/102-auth-oauth-sso)
- [Banking Ledger](https://thedesignround.com/machine-coding/problems/103-banking-ledger)
- [Git Version Control](https://thedesignround.com/machine-coding/problems/104-git-version-control)
- [Pub-Sub System (Kafka-lite)](https://thedesignround.com/machine-coding/problems/11-pub-sub)
- [Library Management System](https://thedesignround.com/machine-coding/problems/12-library-management)
- [ATM Machine](https://thedesignround.com/machine-coding/problems/13-atm-machine)
- [Chess Game](https://thedesignround.com/machine-coding/problems/14-chess-game)
- [Logger Library](https://thedesignround.com/machine-coding/problems/15-logger-library)
- [Hotel Booking System](https://thedesignround.com/machine-coding/problems/16-hotel-booking)
- [Cricbuzz Scoreboard](https://thedesignround.com/machine-coding/problems/17-cricbuzz-scoreboard)
- [Notification Service](https://thedesignround.com/machine-coding/problems/18-notification-service)
- [Digital Wallet](https://thedesignround.com/machine-coding/problems/19-digital-wallet)
- [File System (Unix-like)](https://thedesignround.com/machine-coding/problems/20-file-system)
- [Task Planner (Jira-lite)](https://thedesignround.com/machine-coding/problems/21-task-planner)
- [Food Delivery (Zomato-lite)](https://thedesignround.com/machine-coding/problems/22-food-delivery)
- [Cab Sharing (Uber-lite)](https://thedesignround.com/machine-coding/problems/23-cab-sharing)
- [Inventory Management](https://thedesignround.com/machine-coding/problems/24-inventory-management)
- [Search Engine with Trie](https://thedesignround.com/machine-coding/problems/25-search-engine-trie)
- [Coffee Machine](https://thedesignround.com/machine-coding/problems/26-coffee-machine)
- [Online Judge (LeetCode-lite)](https://thedesignround.com/machine-coding/problems/27-online-judge)
- [LinkedIn (Social Graph)](https://thedesignround.com/machine-coding/problems/28-linkedin-social-graph)
- [Stock Brokerage System](https://thedesignround.com/machine-coding/problems/29-stock-brokerage)
- [Distributed ID Generator](https://thedesignround.com/machine-coding/problems/30-distributed-id-gen)
- [In-Memory Cache (LRU/LFU)](https://thedesignround.com/machine-coding/problems/31-in-memory-cache-lru)
- [Job Scheduler](https://thedesignround.com/machine-coding/problems/32-job-scheduler)
- [Deck of Cards / Poker](https://thedesignround.com/machine-coding/problems/33-deck-of-cards-poker)
- [Car Rental System](https://thedesignround.com/machine-coding/problems/34-car-rental-system)
- [Smart Home System](https://thedesignround.com/machine-coding/problems/35-smart-home-system)
- [Coupon Management System](https://thedesignround.com/machine-coding/problems/36-coupon-management)
- [Discord / Slack (Messaging)](https://thedesignround.com/machine-coding/problems/37-discord-slack)
- [Circuit Breaker](https://thedesignround.com/machine-coding/problems/38-circuit-breaker)
- [In-Memory SQL Database](https://thedesignround.com/machine-coding/problems/39-in-memory-db-sql)
- [Expense Tracker](https://thedesignround.com/machine-coding/problems/40-expense-tracker)
- [Ride Pooling Logic](https://thedesignround.com/machine-coding/problems/41-ride-pooling-logic)
- [Ad-Serving Engine](https://thedesignround.com/machine-coding/problems/42-ad-serving-engine)
- [Survey Monkey (Survey System)](https://thedesignround.com/machine-coding/problems/43-survey-monkey)
- [Crypto Wallet](https://thedesignround.com/machine-coding/problems/44-crypto-wallet)
- [Tinder Swipe Engine](https://thedesignround.com/machine-coding/problems/45-tinder-swipe-engine)
- [Podcast Player](https://thedesignround.com/machine-coding/problems/46-podcast-player)
- [Workflow Engine](https://thedesignround.com/machine-coding/problems/47-workflow-engine)
- [A/B Testing Library](https://thedesignround.com/machine-coding/problems/48-ab-testing-library)
- [Fraud Detection Rules Engine](https://thedesignround.com/machine-coding/problems/49-fraud-detection-rules)
- [Basic Blockchain](https://thedesignround.com/machine-coding/problems/50-blockchain-basic)
- [Package Manager](https://thedesignround.com/machine-coding/problems/51-package-manager)
- [News Feed Ranker](https://thedesignround.com/machine-coding/problems/52-news-feed-ranker)
- [Airport Management System](https://thedesignround.com/machine-coding/problems/53-airport-management)
- [Auction System](https://thedesignround.com/machine-coding/problems/54-auction-system)
- [Unit Testing Framework](https://thedesignround.com/machine-coding/problems/55-unit-testing-framework)
- [Excel / Spreadsheet Engine](https://thedesignround.com/machine-coding/problems/56-excel-spreadsheet)
- [Email Client](https://thedesignround.com/machine-coding/problems/57-email-client)
- [Health Tracker](https://thedesignround.com/machine-coding/problems/58-health-tracker)
- [Food Recipe App](https://thedesignround.com/machine-coding/problems/59-food-recipe-app)
- [Property Rental (Airbnb)](https://thedesignround.com/machine-coding/problems/60-property-rental-airbnb)
- [E-commerce Cart & Checkout](https://thedesignround.com/machine-coding/problems/61-ecommerce-cart)
- [Railway Booking System](https://thedesignround.com/machine-coding/problems/62-railway-booking)
- [Distributed Lock Manager](https://thedesignround.com/machine-coding/problems/63-distributed-lock)
- [Pastebin (LLD)](https://thedesignround.com/machine-coding/problems/64-pastebin-lld)
- [Image Gallery](https://thedesignround.com/machine-coding/problems/65-image-gallery)
- [Music Playlist Manager](https://thedesignround.com/machine-coding/problems/66-music-playlist)
- [Thumbnail Service](https://thedesignround.com/machine-coding/problems/67-thumbnail-service)
- [Ephemeral Stories](https://thedesignround.com/machine-coding/problems/68-ephemeral-stories)
- [User Presence System](https://thedesignround.com/machine-coding/problems/69-user-presence)
- [Follower / Following System](https://thedesignround.com/machine-coding/problems/70-follower-system)
- [Mentions & Tagging System](https://thedesignround.com/machine-coding/problems/71-mentions-tagging)
- [Live Reactions System](https://thedesignround.com/machine-coding/problems/72-live-reactions)
- [Live Comments System](https://thedesignround.com/machine-coding/problems/73-live-comments)
- [Like Count System (Sharded)](https://thedesignround.com/machine-coding/problems/74-like-count-sharded)
- [Metrics Aggregator](https://thedesignround.com/machine-coding/problems/75-metrics-aggregator)
- [Real-time Dashboard](https://thedesignround.com/machine-coding/problems/76-realtime-dashboard)
- [On-Call Pager / Escalation System](https://thedesignround.com/machine-coding/problems/77-oncall-pager)
- [Geofencing Library](https://thedesignround.com/machine-coding/problems/78-geofencing-lib)
- [Foursquare Check-In System](https://thedesignround.com/machine-coding/problems/79-foursquare-checkin)
- [ETA Calculator](https://thedesignround.com/machine-coding/problems/80-eta-calculator)
- [Bike Sharing System](https://thedesignround.com/machine-coding/problems/81-bike-sharing)
- [Tinder Advanced (Elo/Glicko)](https://thedesignround.com/machine-coding/problems/82-tinder-advanced)
- [Quora (LLD)](https://thedesignround.com/machine-coding/problems/83-quora-lld)
- [Video Recommendation Engine (LLD)](https://thedesignround.com/machine-coding/problems/84-video-rec-engine)
- [Shopping Cart (Guest Merge)](https://thedesignround.com/machine-coding/problems/85-shopping-cart-merge)
- [Inventory Management (Advanced)](https://thedesignround.com/machine-coding/problems/86-inventory-advanced)
- [Order Manager](https://thedesignround.com/machine-coding/problems/87-order-manager)
- [Review & Rating System](https://thedesignround.com/machine-coding/problems/88-review-system)
- [Price Comparison Engine](https://thedesignround.com/machine-coding/problems/89-price-compare)
- [Discount Engine](https://thedesignround.com/machine-coding/problems/90-discount-engine)
- [Surge Pricing Engine](https://thedesignround.com/machine-coding/problems/91-surge-pricing)
- [Digital Wallet (Advanced)](https://thedesignround.com/machine-coding/problems/92-digital-wallet-advanced)
- [Multi-Currency Wallet](https://thedesignround.com/machine-coding/problems/93-multi-currency)
- [Email Search Engine](https://thedesignround.com/machine-coding/problems/94-email-search)
- [Crypto Exchange](https://thedesignround.com/machine-coding/problems/95-crypto-exchange)
- [Game Leaderboard (Min-Heap/Skip List)](https://thedesignround.com/machine-coding/problems/96-leaderboard-games)
- [Shared Calendar](https://thedesignround.com/machine-coding/problems/97-shared-calendar)
- [Backup Manager](https://thedesignround.com/machine-coding/problems/98-backup-manager)
- [Feature Store (ML)](https://thedesignround.com/machine-coding/problems/99-feature-store)

## 🏢 Company-Specific Interview Prep
### System Design Companies
- [adyen System Design Interview](https://thedesignround.com/interviews/adyen-system-design)
- [airbnb System Design Interview](https://thedesignround.com/interviews/airbnb-system-design)
- [alibaba System Design Interview](https://thedesignround.com/interviews/alibaba-system-design)
- [amazon System Design Interview](https://thedesignround.com/interviews/amazon-system-design)
- [amplitude System Design Interview](https://thedesignround.com/interviews/amplitude-system-design)
- [anthropic System Design Interview](https://thedesignround.com/interviews/anthropic-system-design)
- [apple System Design Interview](https://thedesignround.com/interviews/apple-system-design)
- [atlassian System Design Interview](https://thedesignround.com/interviews/atlassian-system-design)
- [auth0 System Design Interview](https://thedesignround.com/interviews/auth0-system-design)
- [aws System Design Interview](https://thedesignround.com/interviews/aws-system-design)
- [backblaze System Design Interview](https://thedesignround.com/interviews/backblaze-system-design)
- [binance System Design Interview](https://thedesignround.com/interviews/binance-system-design)
- [bittorrent System Design Interview](https://thedesignround.com/interviews/bittorrent-system-design)
- [block System Design Interview](https://thedesignround.com/interviews/block-system-design)
- [bolt System Design Interview](https://thedesignround.com/interviews/bolt-system-design)
- [booking.com System Design Interview](https://thedesignround.com/interviews/booking.com-system-design)
- [bumble System Design Interview](https://thedesignround.com/interviews/bumble-system-design)
- [bytedance System Design Interview](https://thedesignround.com/interviews/bytedance-system-design)
- [cisco System Design Interview](https://thedesignround.com/interviews/cisco-system-design)
- [cloudflare System Design Interview](https://thedesignround.com/interviews/cloudflare-system-design)
- [cognition System Design Interview](https://thedesignround.com/interviews/cognition-system-design)
- [cohere System Design Interview](https://thedesignround.com/interviews/cohere-system-design)
- [coinbase System Design Interview](https://thedesignround.com/interviews/coinbase-system-design)
- [confluent System Design Interview](https://thedesignround.com/interviews/confluent-system-design)
- [coreos System Design Interview](https://thedesignround.com/interviews/coreos-system-design)
- [cursor System Design Interview](https://thedesignround.com/interviews/cursor-system-design)
- [datadog System Design Interview](https://thedesignround.com/interviews/datadog-system-design)
- [debezium System Design Interview](https://thedesignround.com/interviews/debezium-system-design)
- [didi System Design Interview](https://thedesignround.com/interviews/didi-system-design)
- [discord System Design Interview](https://thedesignround.com/interviews/discord-system-design)
- [disney System Design Interview](https://thedesignround.com/interviews/disney-system-design)
- [doordash System Design Interview](https://thedesignround.com/interviews/doordash-system-design)
- [dropbox System Design Interview](https://thedesignround.com/interviews/dropbox-system-design)
- [ebay System Design Interview](https://thedesignround.com/interviews/ebay-system-design)
- [elastic System Design Interview](https://thedesignround.com/interviews/elastic-system-design)
- [epic-games System Design Interview](https://thedesignround.com/interviews/epic-games-system-design)
- [expedia System Design Interview](https://thedesignround.com/interviews/expedia-system-design)
- [fastmail System Design Interview](https://thedesignround.com/interviews/fastmail-system-design)
- [feast System Design Interview](https://thedesignround.com/interviews/feast-system-design)
- [figma System Design Interview](https://thedesignround.com/interviews/figma-system-design)
- [flipkart System Design Interview](https://thedesignround.com/interviews/flipkart-system-design)
- [foursquare System Design Interview](https://thedesignround.com/interviews/foursquare-system-design)
- [github System Design Interview](https://thedesignround.com/interviews/github-system-design)
- [gitlab System Design Interview](https://thedesignround.com/interviews/gitlab-system-design)
- [goldman-sachs System Design Interview](https://thedesignround.com/interviews/goldman-sachs-system-design)
- [google System Design Interview](https://thedesignround.com/interviews/google-system-design)
- [grab System Design Interview](https://thedesignround.com/interviews/grab-system-design)
- [grafana System Design Interview](https://thedesignround.com/interviews/grafana-system-design)
- [groupon System Design Interview](https://thedesignround.com/interviews/groupon-system-design)
- [grubhub System Design Interview](https://thedesignround.com/interviews/grubhub-system-design)
- [hackerrank System Design Interview](https://thedesignround.com/interviews/hackerrank-system-design)
- [hashicorp System Design Interview](https://thedesignround.com/interviews/hashicorp-system-design)
- [hinge System Design Interview](https://thedesignround.com/interviews/hinge-system-design)
- [influxdata System Design Interview](https://thedesignround.com/interviews/influxdata-system-design)
- [instacart System Design Interview](https://thedesignround.com/interviews/instacart-system-design)
- [instagram System Design Interview](https://thedesignround.com/interviews/instagram-system-design)
- [jpmorgan-chase System Design Interview](https://thedesignround.com/interviews/jpmorgan-chase-system-design)
- [kong System Design Interview](https://thedesignround.com/interviews/kong-system-design)
- [kraken System Design Interview](https://thedesignround.com/interviews/kraken-system-design)
- [launchdarkly System Design Interview](https://thedesignround.com/interviews/launchdarkly-system-design)
- [leetcode System Design Interview](https://thedesignround.com/interviews/leetcode-system-design)
- [lime System Design Interview](https://thedesignround.com/interviews/lime-system-design)
- [linkedin System Design Interview](https://thedesignround.com/interviews/linkedin-system-design)
- [lyft System Design Interview](https://thedesignround.com/interviews/lyft-system-design)
- [mapbox System Design Interview](https://thedesignround.com/interviews/mapbox-system-design)
- [match-group System Design Interview](https://thedesignround.com/interviews/match-group-system-design)
- [meta System Design Interview](https://thedesignround.com/interviews/meta-system-design)
- [microsoft System Design Interview](https://thedesignround.com/interviews/microsoft-system-design)
- [mixpanel System Design Interview](https://thedesignround.com/interviews/mixpanel-system-design)
- [nasdaq System Design Interview](https://thedesignround.com/interviews/nasdaq-system-design)
- [neo4j System Design Interview](https://thedesignround.com/interviews/neo4j-system-design)
- [netflix System Design Interview](https://thedesignround.com/interviews/netflix-system-design)
- [nyse System Design Interview](https://thedesignround.com/interviews/nyse-system-design)
- [okta System Design Interview](https://thedesignround.com/interviews/okta-system-design)
- [openai System Design Interview](https://thedesignround.com/interviews/openai-system-design)
- [optimizely System Design Interview](https://thedesignround.com/interviews/optimizely-system-design)
- [pagerduty System Design Interview](https://thedesignround.com/interviews/pagerduty-system-design)
- [paypal System Design Interview](https://thedesignround.com/interviews/paypal-system-design)
- [pinecone System Design Interview](https://thedesignround.com/interviews/pinecone-system-design)
- [pinterest System Design Interview](https://thedesignround.com/interviews/pinterest-system-design)
- [prometheus System Design Interview](https://thedesignround.com/interviews/prometheus-system-design)
- [quora System Design Interview](https://thedesignround.com/interviews/quora-system-design)
- [reddit System Design Interview](https://thedesignround.com/interviews/reddit-system-design)
- [redislabs System Design Interview](https://thedesignround.com/interviews/redislabs-system-design)
- [revolut System Design Interview](https://thedesignround.com/interviews/revolut-system-design)
- [riot-games System Design Interview](https://thedesignround.com/interviews/riot-games-system-design)
- [robinhood System Design Interview](https://thedesignround.com/interviews/robinhood-system-design)
- [roblox System Design Interview](https://thedesignround.com/interviews/roblox-system-design)
- [segment System Design Interview](https://thedesignround.com/interviews/segment-system-design)
- [shopify System Design Interview](https://thedesignround.com/interviews/shopify-system-design)
- [slack System Design Interview](https://thedesignround.com/interviews/slack-system-design)
- [snap System Design Interview](https://thedesignround.com/interviews/snap-system-design)
- [sony System Design Interview](https://thedesignround.com/interviews/sony-system-design)
- [splunk System Design Interview](https://thedesignround.com/interviews/splunk-system-design)
- [spotify System Design Interview](https://thedesignround.com/interviews/spotify-system-design)
- [square System Design Interview](https://thedesignround.com/interviews/square-system-design)
- [stripe System Design Interview](https://thedesignround.com/interviews/stripe-system-design)
- [target System Design Interview](https://thedesignround.com/interviews/target-system-design)
- [tecton System Design Interview](https://thedesignround.com/interviews/tecton-system-design)
- [temporal System Design Interview](https://thedesignround.com/interviews/temporal-system-design)
- [ticketmaster System Design Interview](https://thedesignround.com/interviews/ticketmaster-system-design)
- [tinder System Design Interview](https://thedesignround.com/interviews/tinder-system-design)
- [tradedesk System Design Interview](https://thedesignround.com/interviews/tradedesk-system-design)
- [tripadvisor System Design Interview](https://thedesignround.com/interviews/tripadvisor-system-design)
- [twitch System Design Interview](https://thedesignround.com/interviews/twitch-system-design)
- [twitter System Design Interview](https://thedesignround.com/interviews/twitter-system-design)
- [uber System Design Interview](https://thedesignround.com/interviews/uber-system-design)
- [valve System Design Interview](https://thedesignround.com/interviews/valve-system-design)
- [walmart System Design Interview](https://thedesignround.com/interviews/walmart-system-design)
- [whatsapp System Design Interview](https://thedesignround.com/interviews/whatsapp-system-design)
- [wise System Design Interview](https://thedesignround.com/interviews/wise-system-design)
- [yahoo System Design Interview](https://thedesignround.com/interviews/yahoo-system-design)
- [yelp System Design Interview](https://thedesignround.com/interviews/yelp-system-design)
- [zoom System Design Interview](https://thedesignround.com/interviews/zoom-system-design)

### Machine Coding Companies
- [airbnb Machine Coding Interview](https://thedesignround.com/interviews/airbnb-machine-coding)
- [alibaba Machine Coding Interview](https://thedesignround.com/interviews/alibaba-machine-coding)
- [amadeus Machine Coding Interview](https://thedesignround.com/interviews/amadeus-machine-coding)
- [amazon Machine Coding Interview](https://thedesignround.com/interviews/amazon-machine-coding)
- [amtrak Machine Coding Interview](https://thedesignround.com/interviews/amtrak-machine-coding)
- [apple Machine Coding Interview](https://thedesignround.com/interviews/apple-machine-coding)
- [atlassian Machine Coding Interview](https://thedesignround.com/interviews/atlassian-machine-coding)
- [auth0 Machine Coding Interview](https://thedesignround.com/interviews/auth0-machine-coding)
- [aws Machine Coding Interview](https://thedesignround.com/interviews/aws-machine-coding)
- [binance Machine Coding Interview](https://thedesignround.com/interviews/binance-machine-coding)
- [bird Machine Coding Interview](https://thedesignround.com/interviews/bird-machine-coding)
- [block Machine Coding Interview](https://thedesignround.com/interviews/block-machine-coding)
- [boeing Machine Coding Interview](https://thedesignround.com/interviews/boeing-machine-coding)
- [bolt Machine Coding Interview](https://thedesignround.com/interviews/bolt-machine-coding)
- [booking.com Machine Coding Interview](https://thedesignround.com/interviews/booking.com-machine-coding)
- [bumble Machine Coding Interview](https://thedesignround.com/interviews/bumble-machine-coding)
- [bytedance Machine Coding Interview](https://thedesignround.com/interviews/bytedance-machine-coding)
- [coinbase Machine Coding Interview](https://thedesignround.com/interviews/coinbase-machine-coding)
- [confluent Machine Coding Interview](https://thedesignround.com/interviews/confluent-machine-coding)
- [datadog Machine Coding Interview](https://thedesignround.com/interviews/datadog-machine-coding)
- [discord Machine Coding Interview](https://thedesignround.com/interviews/discord-machine-coding)
- [doordash Machine Coding Interview](https://thedesignround.com/interviews/doordash-machine-coding)
- [dropbox Machine Coding Interview](https://thedesignround.com/interviews/dropbox-machine-coding)
- [dynatrace Machine Coding Interview](https://thedesignround.com/interviews/dynatrace-machine-coding)
- [ebay Machine Coding Interview](https://thedesignround.com/interviews/ebay-machine-coding)
- [elastic Machine Coding Interview](https://thedesignround.com/interviews/elastic-machine-coding)
- [epic-games Machine Coding Interview](https://thedesignround.com/interviews/epic-games-machine-coding)
- [expedia Machine Coding Interview](https://thedesignround.com/interviews/expedia-machine-coding)
- [feast Machine Coding Interview](https://thedesignround.com/interviews/feast-machine-coding)
- [fitbit Machine Coding Interview](https://thedesignround.com/interviews/fitbit-machine-coding)
- [flipkart Machine Coding Interview](https://thedesignround.com/interviews/flipkart-machine-coding)
- [foursquare Machine Coding Interview](https://thedesignround.com/interviews/foursquare-machine-coding)
- [github Machine Coding Interview](https://thedesignround.com/interviews/github-machine-coding)
- [gitlab Machine Coding Interview](https://thedesignround.com/interviews/gitlab-machine-coding)
- [goldman-sachs Machine Coding Interview](https://thedesignround.com/interviews/goldman-sachs-machine-coding)
- [google Machine Coding Interview](https://thedesignround.com/interviews/google-machine-coding)
- [grab Machine Coding Interview](https://thedesignround.com/interviews/grab-machine-coding)
- [grafana Machine Coding Interview](https://thedesignround.com/interviews/grafana-machine-coding)
- [hackerrank Machine Coding Interview](https://thedesignround.com/interviews/hackerrank-machine-coding)
- [hashicorp Machine Coding Interview](https://thedesignround.com/interviews/hashicorp-machine-coding)
- [hertz Machine Coding Interview](https://thedesignround.com/interviews/hertz-machine-coding)
- [hotstar Machine Coding Interview](https://thedesignround.com/interviews/hotstar-machine-coding)
- [instagram Machine Coding Interview](https://thedesignround.com/interviews/instagram-machine-coding)
- [intuit Machine Coding Interview](https://thedesignround.com/interviews/intuit-machine-coding)
- [irctc Machine Coding Interview](https://thedesignround.com/interviews/irctc-machine-coding)
- [jetbrains Machine Coding Interview](https://thedesignround.com/interviews/jetbrains-machine-coding)
- [jpmorgan-chase Machine Coding Interview](https://thedesignround.com/interviews/jpmorgan-chase-machine-coding)
- [kraken Machine Coding Interview](https://thedesignround.com/interviews/kraken-machine-coding)
- [ledger Machine Coding Interview](https://thedesignround.com/interviews/ledger-machine-coding)
- [lime Machine Coding Interview](https://thedesignround.com/interviews/lime-machine-coding)
- [linkedin Machine Coding Interview](https://thedesignround.com/interviews/linkedin-machine-coding)
- [lyft Machine Coding Interview](https://thedesignround.com/interviews/lyft-machine-coding)
- [match-group Machine Coding Interview](https://thedesignround.com/interviews/match-group-machine-coding)
- [meta Machine Coding Interview](https://thedesignround.com/interviews/meta-machine-coding)
- [microsoft Machine Coding Interview](https://thedesignround.com/interviews/microsoft-machine-coding)
- [netflix Machine Coding Interview](https://thedesignround.com/interviews/netflix-machine-coding)
- [npm Machine Coding Interview](https://thedesignround.com/interviews/npm-machine-coding)
- [okta Machine Coding Interview](https://thedesignround.com/interviews/okta-machine-coding)
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- [optimizely Machine Coding Interview](https://thedesignround.com/interviews/optimizely-machine-coding)
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- [sabre Machine Coding Interview](https://thedesignround.com/interviews/sabre-machine-coding)
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- [slack Machine Coding Interview](https://thedesignround.com/interviews/slack-machine-coding)
- [snap Machine Coding Interview](https://thedesignround.com/interviews/snap-machine-coding)
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- [wise Machine Coding Interview](https://thedesignround.com/interviews/wise-machine-coding)
- [yahoo Machine Coding Interview](https://thedesignround.com/interviews/yahoo-machine-coding)
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- [zynga Machine Coding Interview](https://thedesignround.com/interviews/zynga-machine-coding)

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