Multi-Tenant E-Commerce Demo
Spring Boot + GraphQL + Next.js
Developed multi-tenant B2B2C e-commerce platform demo showcasing modern headless commerce architecture. System supports tenant isolation with schema-per-tenant PostgreSQL strategy, custom branding per tenant, complex pricing engine (tiered, volume discounts, coupons), multi-warehouse inventory synchronization. GraphQL APIs (Apollo Server) provide flexible data fetching for web/mobile clients. Next.js 14 headless storefront with App Router, Server Components, React 18. Payment abstraction layer supporting Stripe, PayPal, Razorpay. Elasticsearch for product search with faceted filtering and autocomplete.
The Challenge
Multi-tenant e-commerce requires tenant data isolation, custom branding per tenant, complex pricing (tiered, volume discounts), inventory sync across warehouses. Headless commerce APIs need flexible data fetching (GraphQL). Payment abstraction across providers (Stripe, PayPal). Product search requires faceted filtering, autocomplete. Checkout optimization critical for conversion.
The Solution
Built multi-tenant platform with schema-per-tenant PostgreSQL isolation. Spring Boot 3 backend with GraphQL (Apollo) providing headless APIs. Next.js 14 storefront with App Router and Server Components. Complex pricing engine handling tiered pricing, volume discounts, coupons. Elasticsearch for product search. Payment abstraction supporting multiple providers. Multi-warehouse inventory sync.
Technology Stack
Architecture
- Multi-tenant: schema-per-tenant PostgreSQL isolation strategy
- GraphQL APIs: Apollo Server with DataLoader for efficient data fetching
- Next.js 14 App Router with React Server Components
- Complex pricing engine: tiered, volume discounts, coupon validation
- Elasticsearch for product search and autocomplete
- Payment abstraction layer: unified interface for Stripe/PayPal/Razorpay
- Multi-warehouse inventory sync with Redis caching
- Order state machine: pending → confirmed → shipped → delivered
- WebSocket real-time inventory updates via Spring Boot
- Docker Compose orchestration: 5+ containers
- Headless commerce (GraphQL + REST APIs)
- Event-driven architecture (Kafka)
- Microservices (product, cart, order, payment, inventory)
- Service mesh (Istio)
- Distributed cart management (Redis)
- Real-time inventory sync (eventual consistency)
- Recommendation engine (collaborative filtering)
- Analytics pipeline (ClickHouse)
- Multi-warehouse fulfillment orchestration
- Row-level security (RLS) for multi-tenancy
- CDN distribution (CloudFront)
- Horizontal pod autoscaling
Key Features
Results & Impact
- Multi-tenant architecture: schema-per-tenant PostgreSQL isolation
- GraphQL APIs (Apollo Server) for flexible headless commerce
- Next.js 14 storefront with App Router and React Server Components
- Complex pricing engine: tiered pricing, volume discounts, coupon stacking
- Elasticsearch product search with faceted filtering and autocomplete
- Payment abstraction: Stripe, PayPal, Razorpay integration
- Multi-warehouse inventory sync with Redis caching
- Tested with 10+ tenants, 1K+ products, simulated checkout flows