4j Traders (E-Commerce Engine)

The Challenge

Unoptimized database schema and lack of transactional isolation levels caused inventory sync errors and order drops during high-traffic flash sales.

The Impact

Guaranteed 100% order transactional integrity and automated multi-tenant system deployments while establishing clear administrative boundaries.

System Architecture

Engineered with NestJS, PostgreSQL, and Prisma ORM utilizing strict ACID transaction protocols. Implemented custom NestJS Guards for multi-role RBAC and containerized the system with Docker and GitHub Actions.

Technology Stack