API Gateway — FastAPI · PostgreSQL · Redis · React
Modern applications depend on dozens of microservices, each with separate authentication, rate limits, and monitoring. Without a unified gateway, teams struggle with inconsistent auth, security gaps, and performance bottlenecks — especially under high concurrency.
Each microservice implements its own JWT validation, session management, and API key checks, resulting in duplicated code, inconsistent security policies, and increased attack surface.
Without a single entry point, rate limiting and request throttling must be configured per service, making it nearly impossible to protect the entire system from DDoS or abuse attacks.
Distributed tracing, request logging, and metrics collection require per-service instrumentation. Teams lack a unified view of API health, latency, and error rates across the entire landscape.
A production-grade API gateway built with FastAPI (Python 3.12) that centralizes authentication, rate limiting, request routing, caching, and monitoring. Services communicate through the gateway via REST, with async worker tasks managed by Celery + Redis and persistent state stored in PostgreSQL 16 — all containerized with Docker and deployed behind Nginx.
Every component designed for secure, scalable, and observable API management across microservices.
Unified JWT and API key authentication with token validation, expiry checks, role-based access control, and automatic request enrichment with user context before proxying to upstream services.
Sliding window rate limiting backed by Redis, with per-endpoint and per-client configuration, burst allowance, and informative Retry-After headers for 429 responses.
Celery distributed task queue with Redis broker for processing heavy workloads: report generation, batch notifications, data synchronization, and webhook dispatch without blocking API responses.
Prometheus metrics for request volume, latency (p50/p95/p99), error rates, and active connections; structured JSON logging with correlation IDs across the entire request lifecycle.
Cache-aside pattern with Redis for frequently accessed data, configurable per-route TTL, automatic cache invalidation on write operations, and graceful fallback to origin on cache miss.
React 19 + TypeScript admin interface with real-time traffic charts, endpoint management, rate limit configuration, user management, and Prometheus/Grafana metrics visualization.
The Enterprise Gateway API provides a production-grade, centralized API management layer that unifies authentication, rate limiting, caching, and observability across microservices. Built with FastAPI and Python 3.12, it leverages Celery for async task orchestration, PostgreSQL 16 for persistent storage, and Redis for caching and rate limiting. The containerized architecture with Docker Compose and Nginx makes it easy to deploy anywhere. With comprehensive monitoring, structured logging, and a React admin dashboard, it serves as both a portfolio-grade reference architecture and a launch-ready solution for API-first organizations.