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#Scalability
5 posts
April 22, 2026
How Big Tech Checks Username Uniqueness at Billion-User Scale
When you type a username and instantly see 'already taken', there's a multi-layer stack doing the work: a probabilistic filter, an in-memory cache, a distributed index, and a load balancer in front of all of them. This post breaks down each data structure, its trade-offs, and how Google, Meta, and Amazon combine them to answer one simple yes/no question in milliseconds across billions of users.
System DesignBloom FilterRedis
April 5, 2026
Netflix Uses Cassandra. Instagram Uses PostgreSQL. Twitter Uses Redis. They're All Right.
Netflix writes 3M records/sec. Instagram serves a billion users. Twitter handles 300K timeline reads/sec. Each picked a radically different database — not because one is better, but because their access patterns are fundamentally different. This post reverse-engineers all three architectures and gives you a mental framework for making these decisions yourself.
System DesignDatabasesCassandra
September 4, 2025
Kafka Explained with Real-Life Examples: Why It Matters and How It Works
Struggling to understand what Kafka is and why everyone talks about it? This post explains Kafka in simple terms using real-life examples. Learn how it solves microservice bottlenecks, enables real-time analytics, scales with partitions, and persists data for replay—making it one of the most powerful tools for modern distributed systems.
Scalability
August 29, 2025
Hexagonal Architecture in Laravel: Code That Lasts Longer Than Frameworks
Laravel makes it easy to ship fast, but that often leads to tight coupling between business logic and infrastructure. Hexagonal Architecture (Ports & Adapters) helps by separating your core domain from frameworks and vendors, making tests faster, integrations swappable, and long-term maintenance smoother. In this blog, we'll break down what Hexagonal means in Laravel terms, where it shines, where it's overkill, and how it compares with MVC and other approaches.
LaravelArchitectureScalability
March 7, 2025
Redis: The Speedy Key-Value Database You Need to Know
Imagine a database so fast it feels like magic, juggling everything from website caching to real-time game leaderboards—and then some! That’s Redis, an in-memory data store that’s become a developer’s secret weapon. In this guide, we’ll unpack what makes Redis tick, explore its versatile data structures, and reveal its lesser-known tricks, like messaging and atomic updates. Whether you’re new to coding or a pro, get ready to see why Redis is transforming apps worldwide!
CachingDatabasePerformance