7 min read Requirements Functional: customers browse restaurants and place orders, restaurants receive and confirm orders, the platform assigns delivery drivers, drivers pick […] Read article
7 min read What Is Apache Kafka? Apache Kafka is a distributed event streaming platform built for high-throughput, fault-tolerant, real-time data pipelines. Unlike […] Read article
8 min read Requirements Functional: subscribe/unsubscribe users to plans, charge recurring fees at billing intervals, support upgrades/downgrades with proration, apply coupons and discounts, […] Read article
7 min read Low-Level Design: Social Media Feed (Twitter/Instagram) A social media feed system manages posts, follows, likes, and generates a personalized home […] 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
8 min read Problem Statement Design a stock trading order book system. Traders submit buy and sell orders at specific prices and quantities. […] Read article
7 min read The 0/1 Knapsack Pattern The 0/1 Knapsack problem is one of the most important DP patterns — its structure appears […] 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
6 min read System Design: Distributed Message Queue (Kafka) A distributed message queue decouples producers (services that generate events) from consumers (services that […] Read article
8 min read Shortest Path Algorithm Interview Patterns (2025) Shortest path problems are fundamental in graph interviews. Knowing when to apply BFS, Dijkstra, […] Read article