Trie (Prefix Tree) Interview Patterns: Autocomplete, Word Search, Wildcard
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
Algorithms
System Design
System Design Interview: Design a Search Engine (Query Processing and Ranking)
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
System Design
System Design Interview: Design a Digital Wallet and Payment System
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
System Design
System Design Interview: Design an E-Commerce Order and Checkout System
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
System Design
System Design Interview: Design a Code Review and Pull Request Platform
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
System Design
System Design Interview: Design a Hotel Reservation System
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
System Design
System Design Interview: Design a Social Media Feed System
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
Algorithms
Backtracking Algorithm Interview Patterns: Subsets, Permutations, N-Queens, Word Search
5 min read Backtracking Algorithm Patterns Backtracking is a systematic way to enumerate all possible solutions by building candidates incrementally and abandoning (pruning) Read article
System Design
System Design Interview: Design a Fleet Management and Vehicle Tracking System
5 min read What Is a Fleet Management System? A fleet management system tracks the real-time location and status of thousands of vehicles Read article
System Design
System Design Interview: Design a Subscription Billing System
5 min read What Is a Subscription Billing System? A subscription billing system automates recurring charges for SaaS products, streaming services, and membership Read article
System Design
System Design Interview: Design a Multi-Tenant SaaS Platform
6 min read What Is a Multi-Tenant SaaS Platform? A multi-tenant SaaS platform serves multiple customers (tenants) from a single shared infrastructure. Each Read article
System Design
System Design Interview: Design a Real-Time Gaming Leaderboard
5 min read What Is a Gaming Leaderboard System? A gaming leaderboard ranks players by score, showing top players globally, regionally, or among Read article
System Design
System Design Interview: Design a Real-Time Collaborative Whiteboard (Miro/Figma)
6 min read What Is a Real-Time Collaborative Whiteboard? A collaborative whiteboard (like Miro, FigJam, or Excalidraw) lets multiple users simultaneously draw, add Read article
System Design
System Design Interview: Design a Healthcare Appointment Booking System
7 min read What Is a Healthcare Appointment Booking System? A healthcare appointment booking system allows patients to schedule, reschedule, and cancel appointments Read article
System Design
System Design Interview: Design a Loyalty and Rewards Points System
4 min read What Is a Loyalty and Rewards System? A loyalty program tracks user activity and awards points redeemable for discounts or Read article
