Case Studies
Classic interview systems designed end to end.
URL Shortener
Designing a read-heavy URL shortener at billions-of-URLs scale — Base62 encoding, distributed ID generation, caching, and CDN edge redirects.
Rate Limiter
Designing a distributed rate limiter for a multi-region API gateway — algorithm selection, Redis-backed token buckets, and fail-open semantics.
Pastebin
Not written yet.
Chat System
Not written yet.
Notification Service
Not written yet.
News Feed
Not written yet.
File Storage
Not written yet.
Video Streaming
Not written yet.
Ride Sharing
Not written yet.
Food Delivery
Not written yet.
Search Autocomplete
Not written yet.
Web Crawler
Not written yet.
API Gateway
Not written yet.
Distributed Cache
Not written yet.
Session Store
Not written yet.
Metrics Monitoring
Not written yet.
Logging Platform
Not written yet.
Analytics Pipeline
Not written yet.
Ad Click Aggregator
Not written yet.
Recommendation System
Not written yet.
Email Service
Not written yet.
Push Notification Platform
Not written yet.
SMS Gateway
Not written yet.
Payment Gateway
Not written yet.
Digital Wallet
Not written yet.
Fraud Detection
Not written yet.
Inventory Management
Not written yet.
Order Management
Not written yet.
E-commerce Marketplace
Not written yet.
Shopping Cart
Not written yet.
Recommendation Feed
Not written yet.
Social Graph
Not written yet.
Presence Service
Not written yet.
Group Messaging
Not written yet.
Live Comments
Not written yet.
Live Streaming Chat
Not written yet.
Collaborative Editor
Not written yet.
Document Storage
Not written yet.
Cloud Drive Sync
Not written yet.
CDN
Not written yet.
Image Hosting
Not written yet.
Photo Sharing
Not written yet.
Video Transcoding Pipeline
Not written yet.
Podcast Platform
Not written yet.
Music Streaming
Not written yet.
Ticket Booking
Not written yet.
Hotel Booking
Not written yet.
Flight Reservation
Not written yet.
Calendar Scheduling
Not written yet.
Meeting Room Booker
Not written yet.
URL Preview Service
Not written yet.
QR Code Platform
Not written yet.
Feature Flag Service
Not written yet.
Configuration Service
Not written yet.
Secrets Management
Not written yet.
Service Discovery
Not written yet.
Distributed Lock Service
Not written yet.
Unique ID Generator
Not written yet.
Search Engine
Not written yet.
Log Search
Not written yet.
Audit Logging
Not written yet.
Object Metadata Service
Not written yet.
Webhook Delivery
Not written yet.
Workflow Orchestrator
Not written yet.
Job Scheduler
Not written yet.
Cron Service
Not written yet.
Queue as a Service
Not written yet.
Pub/Sub Platform
Not written yet.
Event Bus
Not written yet.
Notification Preferences
Not written yet.
Comments System
Not written yet.
Review and Rating
Not written yet.
Blogging Platform
Not written yet.
CMS
Not written yet.
Knowledge Base Search
Not written yet.
Online Judge
Not written yet.
Code Collaboration Platform
Not written yet.
CI/CD Pipeline
Not written yet.
Package Registry
Not written yet.
Container Registry
Not written yet.
IoT Telemetry Platform
Not written yet.
Time Series Database
Not written yet.
Location Tracking
Not written yet.
Maps and Routing
Not written yet.
Geofencing Alerts
Not written yet.
Taxi Dispatch
Not written yet.
Parcel Tracking
Not written yet.
Warehouse Management
Not written yet.
Stock Trading Platform
Not written yet.
Crypto Exchange
Not written yet.
Leaderboard Service
Not written yet.
Multiplayer Matchmaking
Not written yet.
Gaming Presence
Not written yet.
Online Whiteboard
Not written yet.
Learning Management System
Not written yet.
Exam Proctoring
Not written yet.
Telemedicine Platform
Not written yet.
Healthcare Appointment Booking
Not written yet.
Banking Ledger
Not written yet.
Expense Management
Not written yet.