A URL shortener converts a long URL into a compact alias and redirects visitors to the original. Services like bit.ly, […]

Real-time leaderboards rank millions of users by score and serve instant rank queries — ranking by score, top-N lists, and

What Makes Chat Systems Hard? Chat systems look simple on the surface — send a message, receive a message. The

Why Caching Matters Caching is one of the highest-leverage tools in system design. A database read can take 1–10 ms;

Connection pooling is one of those infrastructure details that seems mundane until it isn’t — at which point your application

HTTP/2 and HTTP/3 represent fundamental redesigns of the web’s application protocol, motivated by the performance limitations of HTTP/1.1. This post

Columnar databases power modern analytics workloads — data warehouses, BI dashboards, log analytics, and time-series aggregations. Understanding their internals helps

Garbage collection is the automatic memory management mechanism used by runtimes like the JVM, .NET CLR, and Go. Understanding its

What Is gRPC? gRPC is a high-performance, open-source remote procedure call framework developed by Google. It uses Protocol Buffers (protobuf)

A Merkle tree (invented by Ralph Merkle in 1979) is a binary tree in which every leaf node contains the

What Is a Full-Text Search Engine? A full-text search engine indexes large collections of text documents and retrieves the most

A load balancer distributes incoming traffic across multiple backend instances to maximize throughput, minimize latency, and avoid overloading any single

What Is Event Sourcing? In traditional systems, the database stores the current state of an entity. When an order changes