⏱ 5 min read What Is a Real-Time Chat System? A real-time chat system enables persistent messaging between users with delivery guarantees and online […] Read article

⏱ 6 min read What Is a Configuration Management System? A configuration management system stores key-value configuration data that services read at startup or Read article

⏱ 6 min read What Is a Search Engine? A search engine indexes a corpus of documents and retrieves the most relevant results for Read article

⏱ 5 min read What Is a Fraud Detection System? A fraud detection system identifies and blocks fraudulent transactions, account takeovers, and abuse in Read article

⏱ 5 min read What Is a Digital Wallet? A digital wallet stores funds and enables transfers between users and merchants. Examples: PayPal, Venmo, Read article

⏱ 5 min read What Is a Video Streaming Platform? A video streaming platform stores, processes, and delivers video content to millions of concurrent Read article

⏱ 5 min read What Is a Real-Time Analytics Dashboard? A real-time analytics dashboard displays live metrics and aggregations over streaming data: active users, Read article

⏱ 5 min read What Is an E-Commerce Order System? An e-commerce order system manages the full lifecycle of an online purchase: cart management, Read article

⏱ 6 min read What Is a Code Review Platform? A code review platform allows developers to propose code changes (pull requests), receive line-by-line Read article

⏱ 5 min read What Is a Ride-Sharing System? A ride-sharing platform matches riders requesting trips with nearby available drivers in real time, computes Read article

⏱ 5 min read What Is a Hotel Reservation System? A hotel reservation system manages room inventory, bookings, availability search, and payments for hotels. Read article

⏱ 5 min read What Is a Social Media Feed System? A social media feed aggregates and ranks posts from followed users and surfaces Read article

⏱ 5 min read What Is a Content Moderation System? A content moderation system detects and removes harmful content (hate speech, spam, CSAM, misinformation, Read article