System Design

⏱ 8 min read IoT system design is increasingly common at Amazon (AWS IoT), Google (Cloud IoT), Tesla, Nest, and any company building connected […] Read article

⏱ 8 min read Food delivery is a three-sided marketplace connecting customers, restaurants, and delivery drivers — more complex than ride-sharing because orders involve Read article

⏱ 8 min read Ticketing systems for concerts and sports events are famous for their demand spikes: a Taylor Swift concert sells 50,000 tickets Read article

⏱ 8 min read Designing a live streaming platform is fundamentally different from designing video-on-demand (YouTube). The challenge is latency — live content must Read article

⏱ 7 min read Designing an email system is a favorite at Google (who built Gmail) and at companies that rely heavily on transactional Read article

⏱ 7 min read Product search at Amazon or eBay is one of the most complex search systems in the world. It must combine Read article

⏱ 8 min read Social networks combine graph data structures, feed generation, search, and recommendation systems — all at massive scale. This question appears Read article

⏱ 8 min read Designing a ride-sharing app is a top-5 system design interview question, especially at Uber, Lyft, DoorDash, and Meta. It combines Read article

⏱ 8 min read Rate limiters protect APIs from overload, prevent abuse, and enforce fair usage. Almost every system design interview that involves an Read article

⏱ 7 min read The URL shortener is one of the most common system design interview questions because it touches every major challenge: unique Read article

⏱ 7 min read Notification systems are invisible infrastructure that every major app depends on. A good design handles multiple channels (push, email, SMS), Read article

⏱ 6 min read Apache Kafka underpins event streaming at LinkedIn, Uber, Netflix, Airbnb, and thousands of other companies. Understanding Kafka architecture deeply — Read article

⏱ 9 min read Caching is the first answer to scaling — but designing a correct, consistent caching layer requires careful thought about invalidation, Read article

⏱ 9 min read Behavioral interviews determine whether you will be hired as much as technical interviews at most companies. Google calls them “Googleyness,” Read article

⏱ 6 min read Java remains the dominant language at Amazon, Google, Goldman Sachs, and most enterprise tech companies. This guide covers the Java Read article