⏱ 7 min read Low-Level Design: Hotel Reservation System A hotel reservation system manages room inventory, bookings, availability checks, pricing, and cancellations. It is […] Read article

⏱ 5 min read Sharding and Data Partitioning: System Design Deep Dive Sharding (horizontal partitioning) splits a large dataset across multiple database nodes so Read article

⏱ 7 min read Low-Level Design: Bank Account Transaction System The bank account transaction system LLD models accounts, transactions, and balance management with strong Read article

⏱ 6 min read System Design: Distributed Tracing System (Jaeger/Zipkin-style) Distributed tracing tracks a single request as it propagates through microservices, allowing engineers to Read article

⏱ 6 min read Low-Level Design: Online Code Judge (LeetCode-style) The online code judge LLD involves designing a system that accepts code submissions, compiles Read article

⏱ 7 min read Low-Level Design: Splitwise (Expense Sharing App) The Splitwise LLD asks you to model a shared expense tracker where users add Read article

⏱ 6 min read Low-Level Design: Pub/Sub Message Broker A Pub/Sub (Publish-Subscribe) message broker decouples producers from consumers through named topics. Producers publish events; Read article

⏱ 7 min read Low-Level Design: Task Scheduler The Task Scheduler is a recurring LLD interview question at companies like Google, Meta, Airbnb, and Read article

⏱ 7 min read Consistent Hashing: System Design Deep Dive Consistent hashing is a distributed hashing scheme that minimises key remapping when nodes are Read article

⏱ 9 min read Problem Statement Design a social network graph system like LinkedIn’s connection model or Facebook’s friends graph. Users can send friend Read article

⏱ 9 min read Problem Statement Design a stock trading order book system. Traders submit buy and sell orders at specific prices and quantities. Read article

⏱ 9 min read Problem Statement Design an online auction system like eBay. Sellers list items with a starting price, auction duration, and reserve Read article

⏱ 8 min read Problem Statement Design a search autocomplete (typeahead) system like Google Search suggestions or Amazon product search. As a user types, Read article