Bazaar — Online Marketplace

Problem context

Building a multi-vendor marketplace requires handling complex business logic: vendor onboarding, product catalog management across sellers, inventory synchronization, order splitting across vendors, commission calculation, and a unified checkout experience despite multiple sellers — all while maintaining data consistency under concurrent operations.

Implementation approach

Designed a React frontend with a consumer marketplace view, individual vendor storefronts, and an admin dashboard for platform management.

Implementation approach (2)

Built a Node.js/Express backend with a microservice-inspired modular architecture: separate modules for auth, products, orders, payments, and vendor management.

Outcome and delivery impact

The marketplace handles concurrent purchases without inventory conflicts thanks to optimistic locking and retry logic. Order splitting processes multi-vendor carts in under 200ms.

Outcome and delivery impact (2)

Stripe Connect integration reduced payment reconciliation from a manual daily process to fully automated real-time settlement. Vendors see earnings in their dashboards immediately after order completion.

Reported metrics

• Order Split Time
  Reported value: < 200ms
• Search Response
  Reported value: < 100ms
• Inventory Conflicts
  Reported value: 0
• Payment Settlement
  Reported value: Real-time

Technologies involved

• React
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• Node.js
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• Express
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• MongoDB
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• Stripe Connect
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• Elasticsearch
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• Socket.IO
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