Step 01
Countries & warehouses
Locations, stock, shipping costs and legal constraints.
Cross-border
Cross-border composable commerce
Many warehouses, law and tax in real time
Cross-border composable commerce pairs a headless storefront (e.g. Next.js) with OMS, tax and duty services so shoppers see final, compliant pricing before they pay.
Selling from many locations is not only “another language”. An OMS must pick fulfilment in milliseconds, while pricing must respect VAT, duties, clearance costs and export restrictions per product category. A Next.js headless storefront calls pricing and availability services; MedusaJS or dedicated microservices hold catalogue and orders; NestJS aggregates carriers, customs brokers and finance integrations. This is composable commerce: best-fit modules connected by API contracts.
OMS
Order routing
API
Tax / compliance
Edge
Low latency
Composable
Legal & pricing next to the catalogue
We do not mix customs rules with theme templates — isolated, testable, versioned services.
OMS decides “from where”
Warehouse and parcel selection algorithms — transparent cost to the customer.
Tax as a service
One API for cart and B2B — consistent amounts on invoices and portals.
Headless front
Fast Next.js — A/B tests and locales without touching the order core.
ERP consistency
Stock and orders synchronised — fewer manual fixes after export.
Cooperation process
How does our cooperation look like?
A transparent process that leads from idea to finished product
Step 02
Pricing & tax engine
Services computing live totals for cart and checkout — with audit trails.
Step 03
Headless storefront
Next.js UX layer — fast, testable, multi-channel.
Step 04
Integrations
Carriers, customs brokers, ERP — queues and retries.
Step 05
Observability
Alerts on stock drift and compliance errors.
Key benefits
Why choose us?
Business outcomes first—technology is the means, not the end in itself.
Fulfilment routing
Cost/time optimisation across DCs.
Law & tax
Rule layer for jurisdictions and categories.
Composable
Swap modules without rewriting a monolith.
Omnichannel
Same engine for web and apps.
Questions about this system type
- Why does cross-border break on one monolith?
- Because tax, duties and warehouse routing change faster than UX—composable lets you version and test compliance services separately from the storefront.
- What does the OMS do here?
- It chooses fulfilment sources and shipments for cost, time and availability—often across countries with transparent totals for the buyer.
- Do you integrate carriers and customs?
- Yes—as an integration layer with queues and retries, tied to pricing and order status.
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
R
REST / events
Integracje
Client testimonials
What our clients say?
Case study
Results speak
for themselves.
100 000+
4,9
App StoreApp downloads · 4.9 rating on App Store
SFD app nominated for Mobile Trends Awards 2025 (Commerce). Read more.See the live app
“We talked to many vendors, but after the conversation with Mikołaj from GMI, I felt completely understood and saw my ideas visualized very quickly. That really captivated me, I felt it simply had to succeed. We have a 4.9 rating on the App Store, which I am very proud of. We continue to work with GMI: we have many ideas for further app development.”
Mateusz Pazdan
CEO, SFD S.A.
More partner voices
The same way of working — deliveries for clients across industries.
Below: condensed references from recent years.
Sławomir Rdest
Board Advisor, EMKA S.A. / COO, EMKA Australia at EMKA S.A.
“As long-term clients of GMI Software, we have had the pleasure of working with them for several years. GMI Software stood out during the tender process with their refreshing, positive approach and the professionalism of their CEO and team. The first project was delivered flawlessly, establishing the foundation for a partnership that continues to this day. The GMI Software team members are not only experts in their field but also wonderful people to work with. For any organization seeking a partnership with a reliable and qualified software development company, GMI Software is a fantastic choice.”
5000+
Downloads in 1 month
14
Sprint weeks
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.
Multiple warehouses and allocation strategies
All-in prices with taxes and fees before payment
Headless Next.js + Medusa / NestJS APIs
Logistics and customs integrations
Delivery estimates aligned with real stock
Monitoring and regression tests when regulations change
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.
Preliminary estimate in 48h
Fixed price after DDT — price guarantee
No commitment
We can sign NDA
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.
gmi.software Sp. z o.o.ul. Jana Heweliusza 11 / 819
80-890 Gdansk, Poland
80-890 Gdansk, Poland
NIP: 5252816287KRS: 0000830003
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