How do you build a production B2B storefront with MedusaJS and Next.js?
TL;DR - Quick summary
- B2B is not B2C: Retail stacks break on contract pricing, credit limits and multi-step approvals. Headless (MACH) architecture fixes that boundary.
- MedusaJS v2 backend: Open-source Node.js commerce core for custom flows without SaaS-style take rates (e.g. Shopify Plus).
- Next.js frontend: Fast panels so wholesale buyers can load huge carts without the browser freezing.
- Delivery certainty: GMI Software is a Polish partner offering fixed-price B2B programmes after DDT (Discovery, Design & Technology).
The problem: your B2C stack blocks wholesale
Leaders often force retail platforms into wholesale reality: carts needing manager approval, ERP-driven price lists - plugins bend until they snap.
Result: 8-second loads, brittle warehouse sync, sales ops retyping orders. With 16+ years and 120+ projects across Poland and Europe, GMI Software recommends a dedicated B2B engine you control.
Wholesale flows are a common reason teams adopt headless commerce with Medusa instead of stretching retail SaaS templates.
MedusaJS vs Magento and Shopify Plus
Your core sets operating cost for **five to ten years**:
- SaaS (e.g. Shopify Plus): Strong in B2C. In B2B expect lock-in and fees on large tickets. Deep checkout changes for trade credit are often blocked.
- Monoliths (e.g. Magento): Flexible but heavy to run; upgrades risk the whole stack.
- MedusaJS v2 (GMI’s pick): Headless Node.js, no per-order platform tax, full source control. Modular rules mirror offline procedures.
Compare engines in our MedusaJS development overview - B2B modules, ERP hooks and fixed-price delivery after DDT.
Why Next.js for wholesale panels
Medusa is the engine; buyers touch Next.js. A 2026 B2B portal pairs ERP-grade logic (e.g. Berg System CRM) with consumer-grade responsiveness (e.g. SFD at 100,000+ downloads and 4.9★).
- Speed: React Server Components and disciplined data fetching keep thousand-row tables snappy.
- Reliability: Long cart-building sessions survive browser hiccups.
- Omnichannel: The same Medusa APIs later power a React Native field app without a second backend.
What does a GMI B2B platform cost?
Enterprise budgets are real, but headless lets you phase delivery:
- Budget: Custom MedusaJS B2B, Next.js console, deep PIM / WMS / ERP APIs - typically PLN 160,000-300,000 depending on rules.
- Timeline: Production MVP usually three to six months.
Cost drift is the fear. DDT maps architecture, data, integrations and journeys before code. That is how we can offer a fixed-price guarantee for the agreed scope.
If B2B needs contract pricing, ERP and a wholesale console, model the scope before choosing the platform. Explore MedusaJS development
Frequently asked questions
- Is MedusaJS + Next.js enough for B2B ecommerce?
- Yes, if B2B means owned price lists, sales channels, customer groups, cart and integrations, not a packaged enterprise suite with every module prebuilt. A production project still needs ERP/PIM/WMS, cache strategy, checkout tests and an operating model.
- How much does a MedusaJS and Next.js B2B storefront cost?
- A simple scope usually starts around PLN 160,000-300,000, but cost depends on price lists, product-data quality, ERP/PIM/WMS, approval flows and performance requirements. GMI gives a preliminary estimate in 48h and fixed price after DDT.
- Is the Medusa Next.js Starter suitable for production B2B?
- It is a good starting point, but not a finished B2B portal. You still need buyer roles, contract pricing, channel-based availability, integrations, monitoring, regression tests and customer-data isolation.
- How should MedusaJS connect to ERP in B2B?
- Not every storefront action should call ERP synchronously. We usually build a hybrid model: sync prices, stock and customers into Medusa/read models, validate synchronously only where an error blocks the order, and use queues, retries and alerts for exceptions.
- When should you not build a B2B storefront on MedusaJS?
- Do not build it if catalogue, checkout and pricing are standard and the team needs fast launch more than owned architecture. Shopify B2B, BigCommerce or headless-light can have better TCO in that scenario.
- Does the client own the code after a GMI project?
- Yes. After paid milestones we transfer rights to frontend and backend code. This matters in B2B because price lists, integrations and buying process are part of operating advantage, not just the shop appearance.
Content updated: July 11, 2026