OrderHub, Multi-Tenant Order Platform

A multi-tenant order platform built as a NestJS monorepo with three microservices (orders, inventory, notifications) and a React + Vite frontend, where each tenant sees only its own data. Services communicate through Kafka with a transactional outbox, and email jobs run on RabbitMQ.

• Multi-tenant data model: each tenant sees only its own data
• Role-based access with admin, manager, and viewer roles
• JWT authentication with email/password and Google login
• REST and GraphQL APIs
• Web app pages for orders, new orders, stock, notifications, and team management

• Transactional outbox publishing to Kafka topics orders.events and stock.events, with a dead-letter topic (orders.events.dlq)
• Idempotent inventory consumer that skips duplicate events
• Email jobs on RabbitMQ with retries and a dead-letter queue
• Redis rate limiter and cache
• Cut a reporting API endpoint's response time by ~75% (from ~1.2s to ~300ms) by restructuring PostgreSQL queries, adding indexes, and caching results in Redis
• Docker Compose for all infrastructure: two PostgreSQL databases, Redis, Kafka, and RabbitMQ
• Vitest unit and e2e tests, plus a load-test script

• TypeScript
• NestJS
• React
• Vite
• Kafka
• RabbitMQ
• PostgreSQL
• Redis
• GraphQL
• REST
• Docker Compose
• Vitest

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