Inventory Management System

Architecture

flowchart LR
    Browser -->|HTTPS| Cloudflare -->|HTTPS| Nginx
    Nginx -->|/api/v1/auth/*| Auth["Auth Service<br/>Java · Spring Boot · :8081"]
    Nginx -->|/api/v1/*| Backend["Backend API<br/>Go · chi · :8080"]
    Nginx -->|/| Frontend["Frontend<br/>React · Vite · shadcn/ui"]

    Auth --> AuthDB[("auth_db<br/>PostgreSQL")]
    Auth -->|JWKS| Redis[("Redis")]
    Backend --> InvDB[("inventory<br/>PostgreSQL")]
    Backend --> Redis
    Backend -.->|JWKS fetch| Auth

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Tech Stack

Layer
Frontend	React 19, TypeScript, Vite, TailwindCSS 4, shadcn/ui
Backend	Go 1.25, chi, pgx, golang-jwt
Auth	Java 21, Spring Boot 4, Spring Security, Nimbus JOSE+JWT, Flyway
Database	PostgreSQL 15 (Row-Level Security per tenant)
Cache	Redis 7
Proxy	Nginx 1.27
Infra	Docker Compose, Cloudflare, DigitalOcean

Run (Dev)

make docker/up

Opens backend :8080, auth :8081, frontend :5173.

Run (Dev — Native)

make run

Needs PostgreSQL and Redis running locally.