Architect's Guide

Oct 12, 2026 · Backend Development

Why Microservices Need an API Gateway: Solving Cross-Cutting Concerns Without Code Duplication

This article explains why microservices require an API gateway by comparing three approaches for handling cross-cutting concerns like authentication, demonstrating how gateways eliminate code duplication, reduce service JAR size, and enable centralized updates without redeploying all services, while also covering gateway architecture, core functions, and technology stack recommendations.