Microservices 2024 • Backend Developer

RESTful API & Identity Authentication Gateway

Secure OAuth2 API gateway with Keycloak integration, Redis rate-limiting, and Docker deployment

Executive Summary

Engineered a centralized API authentication gateway unifying multiple backend microservices with Keycloak OAuth2 token validation, Redis session management, and Docker containerization.

The Problem

Microservice ecosystems face fragmented security policies, repetitive authentication logic, and lack of standardized rate limiting across service endpoints.

The Solution

Implemented a Spring Boot API Gateway with Keycloak JWT validation, Redis token caching, and Docker Compose orchestration.

Architecture Specification

Spring Boot Gateway, Keycloak OAuth2/OIDC identity server, Redis token cache, Docker Compose containerization, OpenAPI documentation.

Technical Decisions & Trade-offs

Applied Keycloak OAuth2 JWT Bearer Verification at Gateway Level

Rationale: Offloaded repetitive security checks from downstream business microservices to a dedicated security layer.

Business Impact & Results

Centralized identity management and role-based authorization across microservices.
Reduced downstream authentication latency via Redis token caching.

Lessons Learned

Centralizing token verification at the gateway level simplifies downstream microservice development while enforcing consistent security policies.

TECHNOLOGY STACK

JavaSpring BootKeycloakOAuth2/JWTRedisDockerREST APIPostgreSQL