Building a Multi-Vendor Marketplace: Architecture Decisions

Building a multi-vendor marketplace is one of the most complex web development projects we tackle at Fonix-IT. After delivering 15+ marketplace platforms, we have learned which architectural decisions matter most.

Database Architecture

The most critical decision is your multi-tenancy model. For most marketplaces, we recommend a shared database with tenant isolation via vendor_id foreign keys. This balances cost, complexity, and scalability for businesses up to 10,000 vendors.

Commission System Design

Your commission system needs to handle variable rates per vendor, product category, and promotional periods. We build this as a separate calculation service that can be updated without touching core payment flows.

Payment Architecture

For Bangladeshi marketplaces, we integrate bKash, Nagad, and SSLCommerz with automated vendor payouts. The key is building a payout queue system that handles reconciliation, holds, and dispute resolution.

Conclusion

A well-architected marketplace will save you months of refactoring as you scale. Invest in the right foundation early.