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Microservices architecture has become one of the most popular ways to build scalable, modern, cloud-native applications. Instead of developing one large and tightly coupled system, microservices allow teams to build multiple small, independent services that work together. This approach improves scalability, boosts development speed, and supports continuous delivery. What Are Microservices? Microservices is an architectural style where an application is split into a collection of small, loosely coupled services. Each service is responsible for a single business capability and can be developed, deployed, and scaled independently . Microservices promote polyglot development . For example: One service may use Java + Spring Boot + MySQL . Another may use Node.js + MongoDB . Yet another may run Python or Go . As long as they communicate through well-defined APIs—usually REST, gRPC, or messaging—they can use different languages, frameworks, and databases. Why Move from ...

Amazon API Gateway acts as a single entry point for all your backend services, making it easier to create, manage, secure, and monitor APIs at scale. This beginner-friendly post explains what API Gateway is, why it’s needed, and how it works using a simple demo. What is AWS API Gateway? Amazon API Gateway is a fully managed AWS service that lets you create, publish, maintain, monitor, and secure REST, HTTP, and WebSocket APIs . It works as a “front door” for applications to access data and business logic running on: AWS Lambda EC2 or on-prem servers Containers (ECS/EKS) AWS services like DynamoDB, SQS, Step Functions Even external APIs outside AWS API Gateway handles routing, request validation, throttling, authentication, performance optimization, and monitoring so you don’t have to build these features manually. Why Do We Need an API Gateway? Without an API Gateway, every client (web, mobile, third-party apps) must talk directly to multiple backen...

Introduction: System design can feel overwhelming — especially when vast topics like scalability, performance, reliability, and distributed architecture are thrown at you all at once. But once you master the foundational building blocks, designing robust and scalable systems transforms from stressful to doable. In this post, we’ll explore 30 essential system design concepts with explanation 1. Client–Server Architecture What it is: The foundational model: thin clients (browsers, mobiles, IoT) make requests; servers process logic and return responses. Servers can be single or a pool of machines. Why it matters: It separates concerns — UIs live in clients and heavy computation/state in servers — enabling centralized control, security, and shared business logic. Trade-offs & details: Clients must handle availability issues and degraded connectivity. This model fits web apps, but for extreme scale you need caching, CDNs, and stateless servers (see Diag...