System integration and ERP integration services.

What does system integration actually solve?

System integration removes the human copy-paste between your software. When an order, invoice, customer or stock level changes in one system, the others update automatically. That eliminates retyping, the errors that come with it, and the delays while someone gets round to it. Your teams stop reconciling spreadsheets and start trusting one version of the data.

The symptoms are familiar in most growing companies:

• Sales reps check stock in the ERP, then retype orders from email or phone.
• Finance exports CSVs from the shop and imports them into accounting each week.
• Marketing works from a customer list that is a month out of date.
• Nobody is quite sure which system holds the correct price.

We connect CRM, ERP, billing, accounting, warehouse and marketing tools so that each piece of data has one owner system and flows from there to everywhere it is needed.

Can you integrate our ERP if it has a limited or awkward API?

Usually, yes. Many ERPs, especially older on-premise ones, have limited, poorly documented or unusual interfaces. We have integrated systems such as Subiekt GT and Comarch, where three other agencies had turned the job down in one case. We assess the API during scoping and tell you plainly what is possible before you commit.

When the native interface is restrictive, we typically build a middleware layer that sits between the ERP and the rest of your stack. It reads and writes through whatever the ERP offers, keeps a clean copy of the data in a modern database such as Postgres, and exposes a stable API to your website, shop or portal. Your other tools then talk to the middleware, not to the ERP directly.

That approach protects the ERP from load, lets you add new channels without touching it, and makes the integration easier to monitor. It is the pattern behind both of our ERP case studies.

What did an ERP integration deliver for a wholesale distributor?

A wholesale distributor with 400+ B2B customers was taking 20–30 orders a day by phone and email, each needing about 15 minutes of manual entry. We built a Next.js ordering portal integrated with Subiekt GT in six weeks. Four months after launch, 85% of orders arrive through the portal and admin time is down 70%.

The solution:

• Customer portal – catalogue with contract pricing per client, cart, order history and PDF invoices.
• Middleware – syncs products, stock, contract prices and order history every 15 minutes via the ERP's Sfera API.
• Pricing rules – tiered discounts, bundles and logistics minimums.
• Logistics – carrier integration with automatic labels once an order is confirmed.
• Roles and notifications – admin, account manager and customer roles; Slack alerts for staff, email and SMS for customers.

Average order value rose 34%, and there have been zero pricing errors since launch. Details: B2B portal and ERP integration.

How do you make integrations reliable?

We assume every API will fail at some point and design for it. Events are captured by webhooks, placed in a queue, processed with automatic retries, and logged end to end. If something cannot be resolved automatically, the right person gets an alert with enough context to fix it, before customers or accountants notice.

For lighter flows we orchestrate integrations in n8n or Make; heavier ones get custom code in Python or Node. The choice depends on volume, complexity and who will maintain it.

Can integrations handle unstructured data like invoices and emails?

Yes, by adding an AI step. Integrations traditionally require structured input, but much business data arrives as PDFs, scans and free-text emails. A language model can extract the fields first, after which the normal integration validates and posts them. We use this pattern to feed documents straight into accounting and ERP systems.

For a manufacturer in Łódź, invoices arriving by email are read by GPT-5 Vision, checked against the official VAT whitelist and the supplier database, then posted to Comarch Optima with cost centres and VAT rates mapped. Processing time per invoice fell from about 4 minutes to 8 seconds. See the AI accounting case study, and our AI agent development page for more on this approach.

Unusual documents – a new supplier, an amount above a set threshold, a tax ID missing from the whitelist – are not forced through. They go to an approval queue in Slack, and every decision is written to an audit log, so the integration stays as trustworthy as the rule-based flows around it.

How do integrations help an e-commerce business?

In e-commerce, integrations keep stock, orders and shipping in step across the shop, warehouse, carriers and marketing tools. Without them, overselling, late dispatch and manual label printing eat into margin. With them, an order placed at midnight is in the warehouse queue, labelled and confirmed to the customer before anyone starts work.

For the streetwear brand n-hype we made Baselinker the single source of stock for their Shopify store, syncing every 5 minutes, with automatic order statuses and shipping labels. A separate n8n flow publishes each new collection to Instagram, Meta Ads and a Klaviyo newsletter within a minute of going live in Shopify. Collections now launch three times faster. See the n-hype case study.

Typical e-commerce flows we build:

• Shop ↔ warehouse or 3PL stock and order sync.
• Automatic carrier labels and tracking emails.
• Orders and refunds exported to accounting.
• Customer and purchase events sent to your email platform.

If you are also rebuilding the store itself, see our Shopify development service.

How does an integration project run from first call to launch?

It starts with a free 30-minute call where we map your systems and the data flowing between them. Within 48 hours you receive an architecture, sprint timeline and fixed price. We then build in two-week sprints, test against real data, and launch with monitoring in place and a 30-day warranty.

1. Focus – which systems, which data, who owns each record, and where errors hurt most.
2. Explore – API assessment, data mapping, architecture and fixed-price offer.
3. Transpose – build sprints with demos and daily progress in Notion; feedback within 24 hours.
4. Commit – staged rollout, often in parallel with the old process until numbers match.
5. Handoff – documentation of every flow, credentials and monitoring access.

Running old and new processes side by side for a short period is the safest way to switch: you compare outputs, and only retire the manual process once you trust the integration.

Do you integrate the systems used by companies in other EU countries?

Yes. Integration work is about APIs and data, not geography, and we serve clients in Germany, the UK, the Netherlands, Austria and the Czech Republic. If your ERP, accounting or carrier software has a usable interface, we can connect it. We review its documentation during scoping and flag any limitations before quoting a fixed price.

We work fully remotely on Google Meet, Slack and Notion, during CET business hours, with on-site visits when a project needs them – for example to access an on-premise server. EU B2B clients are invoiced with reverse-charge VAT.

All code is yours: it lives in your repository and runs on your infrastructure, and at the end you receive documentation and every credential.

How much do system and ERP integration services cost?

Integration projects are quoted individually and typically cost between €1,400 and €9,500, depending on the number of systems, data volume and API quality. An ERP integration starts at €1,060, and a simple webhook link between two systems starts at €85. You receive a fixed price within 48 hours of the discovery call.

Frequently asked questions