Org hierarchies
Many people and departments under one customer account — permissions under control.
B2B marketplace
Multi-vendor marketplace for B2B trade
When one cart connects many suppliers and one enterprise buyer
A B2B multi-vendor marketplace connects many suppliers to enterprise buyers in one cart—with split checkout, roles and limits; it almost always needs a custom backend (MACH, NestJS, queues), not a storefront template alone.
This is one of the hardest commerce shapes: you do not only sell your own catalogue — you orchestrate transactions between vendors and buying organizations. That requires account hierarchies (requesters, approvals, finance), contract- and volume-aware pricing, cart splits per supplier, different fulfilment SLAs, and platform fees and settlements. Credit insurance or trade limits are common. Templates rarely survive — we design domain services, API-first contracts and event flows (e.g. NestJS + PostgreSQL + queues), and connect the commerce layer with MedusaJS or a bespoke engine when the model exceeds standard catalogues.
Platform
From many suppliers to one customer order
Complexity sits in rules and data consistency — the UI is a thin layer over events and APIs.
Many SKUs, one checkout
Customers see a single flow; behind the scenes the order splits into fulfilments, stock moves and invoices per vendor.
Rules in domain code
Permissions, limits and contracts enforced in backend services — not in a cart template.
Settlement & fees
Split payment mechanics and platform reporting without manual spreadsheet reconciliation.
Traffic & peaks
Queues, retries and monitoring — readiness for concurrent B2B orders across vendors.
Cooperation process
How does our cooperation look like?
A transparent process that leads from idea to finished product
01
Model & responsibility boundaries
We map parties (platform, vendors, buyers), order lifecycle, settlements and compliance. We define a credible MVP.
02
Organizations & permissions
We design org trees, roles, purchase limits, approval paths and audit trails — the B2B foundation.
03
Cart, split & fulfilment
We split orders per vendor, shipping costs, stock and SLAs. We define partial fulfilment and cancellation rules.
04
Payments & settlement
Split payouts, platform fees, deferred payments, exports to ERP/finance. Gateways and credit partners as required.
05
Scale & observability
Queues, idempotency, monitoring and load tests for “many vendors at once” scenarios.
Key benefits
Why choose us?
Business outcomes first—technology is the means, not the end in itself.
Pricing & contracts
Commercial terms live in the system, not only in spreadsheets.
Split checkout
One customer order, many fulfilments and settlements for suppliers.
Security & audit
Traceability: who ordered, who approved, who sees which prices.
Questions about this system type
- Why is a B2B marketplace rarely “just a shop template”?
- Because beyond a catalogue you need org hierarchies, permissions, cart splits and settlements across suppliers—and often credit workflows. That is domain logic and events, not a theme.
- Do you integrate trade credit or receivables insurance?
- Yes—as a common integration area. We connect finance partners and limit workflows to match your model, with idempotent APIs and audit trails.
- What tech usually backs such an engine?
- Often NestJS domain services, PostgreSQL, queues (Redis/RabbitMQ/SQS), Next.js storefronts; the commerce layer may be MedusaJS or bespoke when orders exceed standard catalogue assumptions.
Content last updated: March 18, 2026
Technologies
What technologies do we use?
Modern tools and proven solutions for the best results
Next.js
Frontend
MedusaJS
Commerce core
NestJS
Backend
TypeScript
Language
PostgreSQL
Database
REST / events
Integracje
Redis
Cache / kolejki
RabbitMQ / SQS
Messaging
Client testimonials
They trusted us and see results.
EMKA S.A.
Sławomir Rdest
Board Advisor, EMKA S.A.
“As long-term clients of GMI Software, we had the pleasure of working with them for several years. GMI Software stood out during the tender process with a refreshing, positive approach and the professionalism of the CEO and team.”
Service scope
What does the service include?
Below is an example scope of work that we adjust to the stage and goals of the project.
Many sellers × institutional buyers
Roles, limits, approvals and purchasing policies
Dynamic pricing from contracts, currencies and tiers
Split payments and platform commission
ERP / finance / credit-insurance integrations
Next.js storefronts or B2B portals on the same backend
Next step
Ready to start?
Schedule a free consultation and learn how we can help with your project. After our DDT process (Discovery, Design & Technology), we offer a price guarantee and a fixed-price agreement.
Contact
Let's talk
about the project.
Have an app idea or need technological support? Write to us — we'll prepare a preliminary analysis and estimate within 48h. Projects that go through our DDT process (Discovery, Design & Technology) come with a price guarantee and a fixed-price agreement — a key differentiator for us.
Write to us[email protected]
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80-890 Gdansk, PolandNearshore product delivery across EU, UK and US time zones.
80-890 Gdansk, PolandNearshore product delivery across EU, UK and US time zones.
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