Segment Tree and Fenwick Tree Interview Patterns: Range Queries and Updates
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
Algorithms
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 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
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
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 Content Moderation System
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
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
Algorithms
Advanced Graph Algorithms: SCC, Articulation Points, Dijkstra, MST
6 min read Advanced Graph Algorithms for Interviews Beyond BFS/DFS and basic shortest paths, interviews at senior levels test Tarjan’s algorithm for SCCs, 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 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 an Inventory Management System (Amazon/Shopify)
5 min read What Is an Inventory Management System? An inventory management system tracks stock levels across warehouses, prevents overselling, coordinates replenishment, and Read article
Algorithms
Shortest Path Algorithm Interview Patterns: Dijkstra, Bellman-Ford, Floyd-Warshall
6 min read Shortest Path Algorithms in Interviews Shortest path problems ask: given a graph with weighted or unweighted edges, what is the 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
6 min read What Is a Healthcare Appointment Booking System? A healthcare appointment booking system allows patients to schedule, reschedule, and cancel appointments Read article