Node.js & MongoDB · 2023
B2B Marketplace Platform
A high-throughput B2B marketplace backend engineered in Node.js, Express, and MongoDB, handling product listings, inventory, tiered customer pricing, order lifecycles, and transaction settlement tracking.
Product Catalog & Pricing
Dynamic catalog indexing supporting bulk pricing tiers, minimum order quantities, and supplier-specific margins.
Order Pipeline & Fulfillment
State-machine order lifecycle tracking from purchase order submission, invoice approval, through to shipping.
Transaction Ledger & Reports
Immutable payment logging and reconciliation reports reconciling escrow, deposits, and settlement payouts.
Core System Features
Engineered RESTful microservice architecture in Node.js and Express handling high concurrent order volumes.
Designed flexible MongoDB document schemas with compound indexing for ultra-fast catalog queries and filtering.
Implemented secure transaction tracking verifying payment events prior to status transitions.
Integrated JWT-based authentication with role-based policies for corporate buyers, suppliers, and system admins.
Built transactional safety mechanisms preventing inventory overselling during simultaneous checkout attempts.
Deployed to AWS with automated deployment scripts and monitoring for high availability.