System Design Interview: Design WhatsApp / Real-Time Messaging
9 min read System Design Interview: Design WhatsApp / Real-Time Messaging Designing a real-time messaging system like WhatsApp or iMessage is a top-tier […] Read article
System Design
Algorithms
Low-Level Design: Snake and Ladder Game (OOP Interview)
6 min read Low-Level Design: Snake and Ladder Game Snake and Ladder (also called Chutes and Ladders) is a popular LLD interview problem Read article
Algorithms
Segment Tree and Fenwick Tree Interview Patterns (2025)
8 min read Segment Tree Interview Patterns (2025) Segment Trees are powerful data structures for range query problems — they answer range sum, Read article
Algorithms
Low-Level Design: ATM Machine (State Pattern Interview)
8 min read Low-Level Design: ATM Machine The ATM Machine is a classic LLD problem that tests state machine design, OOP modeling, and Read article
System Design
System Design Interview: Design YouTube / Video Streaming Platform
8 min read System Design Interview: Design YouTube / Video Streaming Platform Designing YouTube is one of the most comprehensive system design problems Read article
System Design
System Design Interview: Design Instagram / Photo Sharing Platform
7 min read System Design Interview: Design Instagram / Photo Sharing Platform Designing Instagram tests your knowledge of media storage, feed generation, CDN Read article
Algorithms
Low-Level Design: Hotel Booking System (OOP Interview)
7 min read Low-Level Design: Hotel Booking System (OOP) The Hotel Booking System is a rich LLD problem that combines real-world business rules Read article
System Design
Database Sharding: Complete System Design Guide
7 min read Database Sharding: Complete System Design Guide Database sharding is the technique of horizontally partitioning data across multiple database instances (shards). Read article
Algorithms
Low-Level Design: Chess Game (OOP Interview)
11 min read Low-Level Design: Chess Game Designing a chess game is a classic LLD interview question that tests your ability to model Read article
Algorithms
String Manipulation Interview Patterns: Complete Guide (2025)
8 min read String Manipulation Interview Patterns: Complete Guide (2025) String problems are ubiquitous in coding interviews — from anagram detection to complex Read article
System Design
System Design Interview: Design a Distributed Messaging System (Kafka)
9 min read System Design Interview: Design a Distributed Messaging System (Apache Kafka) Understanding distributed messaging systems is essential for senior engineering roles. Read article
System Design
Low-Level Design: Library Management System (OOP Interview)
10 min read Low-Level Design: Library Management System (OOP Interview) The Library Management System is a comprehensive LLD interview problem testing your ability Read article
System Design
System Design Interview: Design a Social Graph (Twitter/LinkedIn)
6 min read System Design Interview: Design a Social Graph (Twitter Follow / LinkedIn Connect) Social graph design is a foundational problem asked Read article
System Design
System Design Interview: Design Dropbox / Google Drive (Cloud Storage)
9 min read System Design Interview: Design Dropbox / Google Drive (Cloud File Storage) Cloud file storage like Dropbox or Google Drive is Read article
System Design
System Design Interview: Design a Distributed File System (HDFS/GFS)
9 min read System Design Interview: Design a Distributed File System (HDFS/GFS) Distributed file systems are foundational infrastructure, powering big data processing, cloud Read article