Multi-Vendor Marketplace Platform
A marketplace where independent sellers run their own shops under one brand: seller onboarding, listings, split payments, commissions, payouts and a platform admin to keep quality high.
Project facts
- Project type
- Multi-vendor marketplace
- Category
- Online stores
- Industry
- Marketplaces & ecommerce
- Technology stack
- Next.js
- React
- TypeScript
- PostgreSQL
- Prisma
- Meilisearch
- Redis
- Stripe
- S3-compatible storage
Overview
This demonstration project shows how a multi-vendor marketplace is structured when it is built as custom software rather than bolted onto a single-shop system. Buyers get one catalogue and one checkout; every seller gets a private portal with their own orders, listings, stock and payouts; the platform team gets the controls to approve sellers, set commission rules and resolve disputes.
The concept is intentionally generic — handmade goods in the screens — because the same structure fits local food producers, B2B suppliers or rental listings.
The challenge
A marketplace has three audiences with conflicting needs. Buyers want one basket across many sellers. Sellers need to see only their own data and get paid correctly. The operator carries the risk: onboarding, fees, refunds and trust. Single-store platforms with marketplace plug-ins rarely separate these cleanly, which leads to manual payout spreadsheets and sellers who can see more than they should.
The solution
The concept models sellers as first-class accounts. Every listing, order line and payout belongs to one seller, and every seller-facing query is scoped to that seller. A single checkout splits the payment per seller through the provider's connected-accounts feature, deducts the platform commission and schedules payouts. The admin reviews new sellers, sets commission per category and handles returns and disputes with a full audit trail.
Key features
- Seller applications with review, identity and bank checks
- Private seller portal with orders, listings, stock and reviews
- One basket and one checkout across several sellers
- Split payments with automatic commission deduction
- Payout schedule and statement per seller
- Commission rules per category or seller
- Returns, disputes and buyer–seller messaging
- Cross-seller search with filters by category, price and seller
Who it is for
- Founders launching a niche marketplace
- Associations or platforms bringing local sellers online
- Wholesalers opening their catalogue to partner suppliers
- Existing shops that want to add third-party sellers
Technical approach
Next.js renders the public catalogue on the server for speed and search visibility; seller and admin portals are authenticated routes in the same app. PostgreSQL with Prisma holds sellers, listings, orders split into per-seller sub-orders, and ledger entries for commissions and payouts. Meilisearch powers cross-seller search. Product images go to S3-compatible storage. Split payments and payouts use the payment provider's connected accounts, driven by signed webhooks.
- Frontend
- Backend
- Database
- Infrastructure
- Integrations
- Integrations
- Stripe ConnectMollie ConnectSMTP
Screens
Customer-facing interface
Admin interface
Mobile & responsive views
Services behind this project
The work in this case study maps onto these services. Each page explains scope, process and what you receive.
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Questions about this type of project
Is this a live marketplace?
No. It is a demonstration project with sample sellers and products. It shows how Saad structures a custom marketplace — seller accounts, split payments, commissions and administration.
How are sellers paid in a custom marketplace?
Usually through the payment provider's connected-accounts product (for example Stripe Connect or Mollie Connect). The buyer pays once, the provider splits the amount per seller, the platform keeps its commission, and payouts follow a schedule you set.
Can a marketplace start small and grow?
Yes. A sensible first version covers seller onboarding, listings, checkout and payouts. Reviews, advanced shipping rules or seller subscriptions can be added in later phases without rebuilding the core.
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From idea to launch
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