4 min read What Is a Service Mesh? A service mesh is an infrastructure layer that handles service-to-service communication in a microservices architecture. […] Read article
5 min read What Is a Location-Based Services System? A location-based services (LBS) system enables geospatial queries: find nearby restaurants, show points of Read article
5 min read What Is a Task Scheduling System? A task scheduling system triggers jobs at specified times or on recurring schedules. Examples: Read article
4 min read 1D Dynamic Programming Interview Patterns 1D DP problems have a state space that reduces to a single index or value. Read article
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 Graph BFS and DFS Interview Patterns Graph traversal is one of the most tested interview topics. BFS (Breadth-First Search) and Read article
6 min read Trie (Prefix Tree) Interview Patterns A Trie (prefix tree) is a tree where each node represents a character in a 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
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
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 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 Digital Wallet? A digital wallet stores funds and enables transfers between users and merchants. Examples: PayPal, Venmo, 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
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 Segment Tree and Fenwick Tree (BIT) Interview Patterns These data structures answer range queries (sum, min, max) and support point Read article
