Headless E-commerce & Monorepo

🔍 Overview

An enterprise-grade headless e-commerce ecosystem built inside a strict TypeScript monorepo to separate presentation layouts from core business capabilities. The platform connects a high-speed Next.js storefront to a robust NestJS backend API exposed through GraphQL, managing relational transactions with PostgreSQL and Prisma ORM.

🌟 Key Features

• Monorepo Architecture (Turborepo): Total decoupling between user-facing applications and shared internal core packages governing the business model.
• Domain-Driven Design (DDD): System logic encapsulated into fully isolated Bounded Contexts handling Catalog, Cart, Checkouts, and Order fulfillments independently.
• Type-Safe GraphQL Contracts: End-to-end strongly typed network communication generated from shared schemas, eliminating unexpected integration data breakages.
• Anti-Corruption Layer (ACL): Implemented architectural boundaries to isolate core domain invariants from third-party payment gateways and shipping provider objects.

🧠 Challenges & Learnings

Shared Contract Orchestration: The main engineering hurdle was mapping the translation boundaries across presentation models, GraphQL schemas, and NestJS domain entities cleanly. It required a strict implementation of data mappers to avoid entity bleeding while maintaining optimal memory utilization.

🎯 Outcome

A highly reliable headless platform ready to scale horizontally. Presentation layers can mutate freely without risking core business invariants, providing a secure, ultra-fast purchase flow with zero compile-time integration friction.