System Design Interview: Design a Feature Flag System
5 min read System Design Interview: Design a Feature Flag System Feature flag (feature toggle) systems allow engineers to enable or disable features […] Read article
System Design
System Design
System Design Interview: Design a Ticketing System (Ticketmaster)
3 min read System Design Interview: Design a Ticketing System (like Ticketmaster) Designing a ticket booking system like Ticketmaster tests your ability to Read article
System Design
System Design Interview: Design a Search Engine (Elasticsearch)
3 min read System Design Interview: Design a Search Engine Designing a search engine tests your understanding of inverted indexes, relevance ranking, distributed Read article
System Design
System Design Interview: Design an E-commerce Checkout System
5 min read What Is an E-commerce Checkout System? The checkout system orchestrates the final steps of an online purchase: cart validation, inventory Read article
System Design
System Design Interview: Design a Social Graph (Friend Connections)
5 min read What Is a Social Graph? A social graph represents relationships between users: friendships (Facebook), follow relationships (Twitter/Instagram), professional connections (LinkedIn). Read article
Algorithms
Sorting Algorithm Interview Patterns: Quicksort, Merge Sort, Counting Sort, Custom Sort
5 min read Sorting Algorithm Interview Patterns While most interviews don’t ask you to implement sorting from scratch, understanding the algorithms helps you Read article
System Design
System Design Interview: Design a Key-Value Store (Redis / DynamoDB)
5 min read What Is a Distributed Key-Value Store? A key-value store maps arbitrary keys to values with O(1) average operations. Distributed key-value Read article
System Design
System Design Interview: Design Google Docs / Collaborative Editing
5 min read What Is Collaborative Document Editing? Real-time collaborative editing allows multiple users to simultaneously edit the same document, with changes from Read article
System Design
System Design Interview: Design a Database Connection Pool
5 min read What Is a Database Connection Pool? Opening a database connection is expensive: TCP handshake, authentication, SSL negotiation, session setup — Read article
Algorithms
Tree Interview Patterns: DFS, BFS, LCA, BST, Tree DP, Serialization
5 min read Tree Interview Patterns Trees appear in nearly every software engineering interview. Mastering the core traversal patterns and recognizing which technique Read article
System Design
System Design Interview: Design a Location-Based Services System (Yelp/Google Maps)
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
Algorithms
1D Dynamic Programming Interview Patterns: House Robber, LIS, Coin Change, Word Break
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
System Design
System Design Interview: Design a Task Scheduling System (Cron/Airflow)
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
Algorithms
Graph BFS and DFS Interview Patterns: Islands, Shortest Path, Cycle Detection
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
System Design
System Design Interview: Design a Real-Time Chat Application (WhatsApp/Slack)
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
