System design practice
System Design Interview Questions and Guided Practice
Build stronger architecture instincts with a public library of guided system design exercises. Move from requirements and API contracts to storage, scale, reliability, and tradeoffs.
270public system design exercises
128companies represented
15practice topics
Recently updated practice
Start with a guided exercise
These recently observed catalog entries show the full guided format. Company tags and dates reflect the public catalog; they do not guarantee a company's current interview process.
Design a Cached Astrologer Listing Service
Design a freshness-bounded profile-listing service that uses Redis for hot reads while surviving stampedes and cache outages without overwhelming its database.
AstrotalkCatalog signal Sep 202645 min4 checkpointsMid-levelDesign a Live A-or-B Survey
Design a high-traffic live survey where viewers cast one A-or-B vote, see fresh results, and the host receives an accurate final tally.
VerkadaCatalog signal Sep 202650 min4 checkpointsJunior, Mid-level, SeniorDesign a Personalized Recommendation System
Design event ingestion, candidate retrieval, ranking, and serving for a bounded personalized user-item catalog.
NetflixOracleCatalog signal Sep 202650 min4 checkpointsJunior, Mid-level, SeniorDesign a Scheduled Job Execution System
Design a durable service that stores future jobs, dispatches them when due, and records retryable execution outcomes safely.
DoorDashRobinhoodCatalog signal Sep 202660 min4 checkpointsSeniorDesign a Shopping Search Bar
Design a shopping search bar that serves low-latency query suggestions and relevant product results while catalog and popularity data change continuously.
eBayCatalog signal Sep 202650 min4 checkpointsJunior, Mid-level, SeniorDesign a Versioned IDE Settings Sync System
Design a settings service that combines personal and team configuration and converges correctly across online and offline IDE clients.
CursorAmazonCatalog signal Sep 202655 min4 checkpointsSeniorDesign an Idempotent Action API
Design a durable command API that produces one business effect and one recoverable outcome across duplicate clicks, retries, races, and lost responses.
AstrotalkCatalog signal Sep 202645 min4 checkpointsMid-levelDesign GPU Host Health Monitoring and Repair
Design a platform that combines GPU-host signals, metrics, and logs to detect unhealthy hosts and safely trigger repair workflows across a 100,000-host fleet.
OracleCatalog signal Sep 202650 min4 checkpointsJunior, Mid-level, SeniorDurable Messaging Chat System
Design a reliable text-chat service for one-to-one and group conversations.
OnePayRazorpayCatalog signal Sep 202661 min4 checkpointsMid-levelAudit a Service Architecture for Reliability
Review a service architecture, choose actionable signals, diagnose an incident, and define changes that support a four-nines objective.
AtlassianAbnormal SecurityCatalog signal Sep 202650 min4 checkpointsMid-level, SeniorConcurrent Worker Processing Platform
Extend a queue-backed worker service to raise throughput safely with leases, concurrency budgets, retries, backpressure, and observable terminal outcomes.
Abnormal SecurityCatalog signal Sep 202655 min4 checkpointsMid-levelDesign an Event-Driven Notification System
Design a reliable multi-channel notification platform with durable event handoff, safe consumers, provider isolation, and recoverable poison messages.
SalesforceReplitCatalog signal Sep 202655 min4 checkpointsMid-level
Complete public index
Browse every exercise by primary topic
All 270 titles below link directly to a guided exercise. The compact index keeps the complete library discoverable without turning this page into an oversized copy of every problem briefing.
Concurrency
49- Design a Scheduled Job Execution System
- Design a Versioned IDE Settings Sync System
- Design an Idempotent Action API
- Concurrent Worker Processing Platform
- Design Heterogeneous Compute Workload Allocation
- Design an Interactive SQL Notebook
- Design an Online Coding Competition Platform
- Design a Distributed Matrix Transpose Service
- Design a Goal-Driven Tool-Using Agent
- Design Opaque-GPU Inference Capacity
- Autonomous-Driving Camera Perception Pipeline
- Customer Support Chat Platform
- Design a Multi-Version Configuration Service
- Design an Online Chess Platform
- Design Human-Governed File Review Agents
- Design an Online Coding Practice Platform
- Design a Durable Work Orchestration Platform
- Design a Distributed Video Generation Platform
- Design a Stateless Generative AI Chat Service
- Design an Extensible Tree Traversal Toolkit
- Design a Browser-Automated Customer Support Agent
- Design a Distributed Crossword Solver
- Design Peer-to-Peer Model Distribution
- Design a Brokerage Order Processing System
- Design a Remote Browser Isolation Service
- Design a Ticket Booking System
- Design a Meeting Bot Allocation and Status Platform
- Design a Campaign Milestone Visitor Reward
- Design a Restaurant Staff Scheduling System
- Design a Declarative Infrastructure Orchestrator
- Design an Embedding and Classification API
- Design a Machine-Learning Job Scheduler
- Design a Three-Day Charity Event System
- Design an Exact-Room Hotel Reservation System
- Design an Iterative Compound-LLM Defense Generator
- Design a Durable Local Event Writer
- Design a Community Chat Platform
- Design a Chat Application with Message and Thread Deletion
- Design a Distributed Recurring Workflow Scheduler
- Design Durable Long-Running Agentic Query Execution
- Design a Real-Time Multiplayer Game
- Design a Matchmaking Service
- Design an Online Code Compiler
- Design a Ticket-to-Pull-Request Coding Agent
- Design a Vending Machine Fleet
- Design an Amazon Locker System
- Design a Real-Time Collaborative Pixel Canvas
- Design a Parking Lot Operations System
- Design a Pre-Trade Risk Checking System
Data Modeling
40- Design Autonomous-Vehicle Sensor Health and Diagnostics
- Food Review System
- Design a Unified SaaS Analytics Platform
- Design a Ticket Context and System Status Platform
- Design an Authenticated Shopping Platform
- Design a Region-Aware User Record Store
- Design an E-Commerce Top-Spender Query
- Design Ride-Hailing Dispatch and Trip Lifecycle
- Design a Course Registration Platform
- Design a Composable AI Function Platform
- Relational Query Index Design
- SQL Index Eligibility Analysis
- Design a Workplace Lunch Ordering Platform
- Design an Asynchronous Bulk Record Update Service
- Design a Multi-Tenant Order-Statistics Index
- Design a Ranked Hybrid Social Feed
- Design Calendar Client State and Recurrence
- Cursor-Paginated Records Service
- Design a Personalized Session Playlist Ranking System
- Design a Calendar Event Collaboration System
- Design an Analytical Data Dashboard
- Design a Weekly User Activity Prediction System
- Design Advertising Order Lifecycle Tracking
- Design an Agent Evaluation Platform
- Design a Prompt Playground
- Chat API and Database System
- Design a Following News Feed Service
- Design a Partner Data Aggregation and Query Service
- Music Playlist System
- Design a Publisher News Feed
- Design an Inventory Management Service
- Design a Product Authentication Platform
- Design a Like/Unlike Service
- Governed SQL Generation Chatbot
- Ingest and Structure Historical Pod Alerts
- Design an External Career Data Analytics Platform
- Design a Robotaxi Teleoperations Analytics Platform
- Design a Video Call Analytics Platform
- Video Platform Capacity Planning
- Design Merchant Product Catalog Ingestion
Caching
38- Design a Cached Astrologer Listing Service
- Design a Shopping Search Bar
- Evolve a Read-Write Record Service
- Design a Personalized News Aggregation Platform
- Design a URL Shortening Service
- Design a Gang-Scheduled GPU Inference Pool
- Design a Flight Search and Booking Aggregator
- Digital Game Distribution Platform
- Design a High-Throughput Single-Node Key-Value Store
- Cache Avalanche Resilience
- Cache-Aside Consistency Recovery
- Design a Distributed Expiring LRU Cache
- Design a Versioned Localization Resource Platform
- Resilient Hotel Search Frontend
- Design a Unique Username Registration System
- Design a Driver Review Leaderboard
- Design a Netflix-Style Streaming Platform
- Design Production ML Serving Observability
- Design a Frontend News Feed with Offline Virtualization
- Design a Marketplace Product Catalog Platform
- Design Retailer Product Catalog Serving
- Bookstore Batch Book-Price API
- IP Address Filtering Service
- Design Shared NFS Read Acceleration
- Design a Chat Application Cache Architecture
- Global Music Streaming Platform
- Social News Feed With Live Engagement
- Design a Production-Ready URL Cache Service
- Design a Financial Portfolio Dashboard
- Design a Global Small-Image Cache
- Design a Rental Car Reservation System
- Design an E-commerce Recommendation Event Pipeline
- Design a Social Feed and Post Detail Experience
- Resilient Sports Statistics Aggregation
- Design a Collaborative Document Workspace Frontend
- Design a Multi-Provider Weather Forecast Service
- Design a Restaurant Menu Catalog Service
- Design a Video Watch and Like Experience
Streaming
25- Design a Top Songs by Country Leaderboard
- Design an Embeddable Streaming Chat Agent
- Redesign a Production Spam Classifier
- Malicious IP Traffic Filtering Platform
- Design a Centralized Log Ingestion and Search Platform
- Design a Rolling Top Error-Services Monitor
- Design a Rolling Top-Users Event Leaderboard
- Design a Global Service Metrics Monitoring and Alerting Platform
- Design a Price Movement Alert Platform
- Design a Rolling Shared-Article Leaderboard
- Design a Healthcare Data Ingestion Pipeline
- Design a Top-Selling Items and Categories Dashboard
- Design a Nearest-Timestamp Device Status Service
- Design a Rolling Restaurant Analytics Dashboard
- Design a Sliding-Window Restaurant Leaderboard
- Design a Mobile Application Event Collection API
- Design an Ad Event Measurement Platform
- Design Trending Design Files
- Rolling Stock Price Alert System
- Design a Loyalty-Data Insight Platform
- Design a Large JSON Transformation Service
- Design a Real-Time Anomaly Detection Service
- Design a Resumable Streaming AI Chat
- Activity Playlist Streaming Service
- Design Flight Price Threshold Alerts
Consistency
23- Design a Live A-or-B Survey
- Design GPU Host Health Monitoring and Repair
- Design an Online Payment Processing System
- Design a Camera Heartbeat Health Dashboard
- Design a Live Relational Database Migration
- Power Plant Operations Platform
- Design a Job Listing Freshness Platform
- Design an Ephemeral Messaging Service
- Design a Continuous Table Merge into NoSQL
- Design an Autonomous-Vehicle Cloud Command System
- Design a Role-Based Token Authorization Platform
- Design a Competitive Ad Exclusion Service
- Design a Web Crawler
- Design an Event Ingestion Platform
- Design a Multimodal Public-Content Safety Platform
- Design a Multimedia Content Moderation Platform
- Design Offline-First Document Autosave and Synchronization
- Design a Downstream-Service Alert Notification System
- Configurable Reward Points Service
- Design Offline Reading-Progress Synchronization
- WAL-Backed Batched Log-Writing System
- Design a Third-Party SaaS Integration Platform
- Design a Personal Finance Aggregation Platform
Search
20- Design a Project-to-Contractor Matching Platform
- Design a Railway Search and Booking Platform
- Internal AI Assistant for Employees
- Design a Marketplace Product Search Service
- Design a Multimodal RAG Retrieval Platform
- Design a Web Crawler and Inverted Index
- Design a Boolean Status Search Index
- Design a Typeahead Suggestion Service
- Grounded Document-Vault Question Answering
- Design a Backend Search Engine
- Design a Multi-Branch Library Management System
- Online Bookseller Platform
- Design an Audio Fingerprint Recognition Service
- Design Vacation Rental Listing Search
- Design Access-Aware Design-File Retrieval and Ranking
- Ranked Deals Discovery and Claim Service
- Design a Conversational Flight Search and Booking Agent
- Vacation Rental Search and Booking
- Design an Event Booking and Analytics Platform
- Enterprise Research Assistant
Storage
17- Design a Blob Storage Service
- Design a Cloud Coding Workspace
- Design an Asynchronous File Analysis and Reporting System
- Design a Time Series Metrics Database
- Design a Video Storage and Streaming Platform
- Design a Reliable Endpoint File Transfer Service
- Design a Seller Product-Image Upload Service
- Design a Model-Weight Deployment Platform
- Hash-Tree Client/Server Synchronization
- Design Cross-Device Wallpaper Synchronization
- Design a Cloud File Storage System
- Design an On-Prem Media Transfer for Cloud GPU Training
- Design an ML Training and Deployment Platform
- Design a Multi-Device Photo Storage System
- Distributed Quoted-Log Tokenization
- Cost-Aware Interactive Content Delivery
- Design a Highly Available Distributed Key-Value Store
Event-Driven
11- Design a Personalized Recommendation System
- Design an Event-Driven Notification System
- Design an E-commerce Order Fulfillment System
- Design a Resilient Multi-Table ETL Pipeline
- Design Multi-Cloud Blob Malware Scanning
- Design Smart-Device Feature Announcement Delivery
- Design Group Purchase Contributions and Settlement
- Design Viral Comment Notification Aggregation
- CI/CD Pipeline Orchestration System
- Design a Radar Sensor Observation Pipeline
- Design a Priority Venue Invitation Platform
Real-Time
11- One-to-One Chat Service
- Design a Software Load Balancer
- Design a Collaborative Document Editor
- Design an Ads Bidding, Pacing, and Forecast Platform
- Design a Live-Stream Chat System
- Design Comments for a Collaborative Canvas
- Design an LLM Content Safety Service
- Design a Real-Time Fleet Location Display
- Design a Real-Time Category Leaderboard
- GPU Telemetry Collection and Analytics Platform
- Design an Authenticated Page Presence Counter
Payments
10- Payment Hold, Charge, and Settlement
- Design In-Store Merchant Payment Reconciliation
- Design an Embedded Pay-by-Bank Checkout
- Donation Platform
- Design a Peer-to-Peer Money Transfer System
- Design a Real-Time Payment Count Dashboard
- Design a Driver Payout System
- Design a Fastag Toll Payment System
- Prepaid Game-Card Payment Network
- Design a Fleet Fuel Payment Monitoring Platform
Messaging
9- Durable Messaging Chat System
- Design a Device Demand-Response Control System
- Design a Grounded Recommendation Chatbot
- Design a Real-Time Direct Messaging System
- Design a Scheduled Fan-Out Delivery Platform
- Design an Enterprise Multi-Tenant Messaging Platform
- Design a Fault-Tolerant Cloud Queue Service
- Design a News Subscription Processing Engine
- Design a Satellite Fleet Management and Ground-Station Communications Platform
Geospatial
6Transactions
6Rate Limiting
3Multi-Region
2Questions about the library
How to use this practice collection
- What system design topics can I practice?
- The current public library contains 270 guided exercises across 15 topics, including architecture, storage, caching, consistency, messaging, and real-time systems.
- How should I use these system design interview questions?
- Choose one exercise, clarify its requirements, define APIs and data ownership, draw the main architecture, and then work through the guided checkpoints. Review tradeoffs only after you have committed to a design.
- Are these guaranteed to be current company interview questions?
- No. Company tags and last-seen dates reflect FastPrep's public catalog evidence, but interview processes change. Use the collection for skills practice rather than as a promise about a current hiring loop.