MG Software · Haarlem
Multiple systems that do not talk to each other cost time, money and lead to errors. MG Software builds reliable connections between your ERP, CRM, webshop, accounting and more.
No more double data entry, no manual copying, no information lost between departments.
Whether it is a one-time data migration or a real-time sync that needs to run 24/7: we design integrations that are reliable under load and give clear error messages when something goes wrong.
We have experience with dozens of APIs and protocols. These are the most requested categories.
Exact Online, SAP, Microsoft Dynamics. Order processing, inventory and financial data synchronised in real-time.
HubSpot, Salesforce, ActiveCampaign. Customer data, leads and campaigns connected to your processes.
Shopify, WooCommerce, Magento, Bol.com. Products, orders and inventory automatically synchronised.
Stripe, Mollie, Adyen. Secure payment flows, subscriptions and invoicing in your application.
Moneybird, Xero, Twinfield. Invoices, VAT and reports processed automatically.
No standard connector available? We build custom REST or GraphQL integrations to fit.
PostNL, DHL, DPD, UPS. Generate shipping labels, update track-and-trace and automate return processing from your own system.
Slack, Microsoft Teams, Twilio. Notifications, chatbots and automated messages that keep your team and customers informed without manual intervention.
A good integration starts with understanding your data flows, not writing code.
Which systems, which data, which direction? We map the current and desired situation.
Sync strategy, error handling, rate limits and fallbacks. A solid plan before we build.
Implementation with thorough tests: edge cases, error scenarios and peak load.
Alerting on failures, logging of all transactions and dashboards for operational insight.
Every integration transports data, and data needs protection. All connections run over TLS encryption, authentication uses OAuth 2.0 or API keys with mandatory rotation, and sensitive credentials are stored in a secrets manager. We do not take shortcuts when it comes to security.
For organisations subject to GDPR, NEN 7510 or sector-specific regulations, we build audit trails in. Every data mutation is logged: who changed what, when, and through which system. That gives you not only insight during an audit, but also helps trace errors in the sync.
We test integrations on security before they go live. That means input validation, rate limiting on both sides and monitoring for unusual patterns. An integration that works is not enough; an integration that works securely is the standard.
Integrations sound simple in theory, but in practice projects run into recognisable obstacles.
Many vendors offer APIs with outdated or incomplete documentation. Fields that do not behave as promised, endpoints that have silently changed or response formats that differ per environment. We have experience reverse-engineering poorly documented APIs and always build our own test layer around them.
External systems limit the number of requests you can make per minute or per hour. During bulk synchronisations that can become a serious bottleneck. We implement intelligent queue systems with exponential backoff and batch processing so your data still arrives on time.
System A stores addresses as one field, system B expects street, number and postal code separately. Currency formats differ, date notations diverge and nullable fields exist on one side but not the other. We build transformation layers that absorb these differences and validate them.
Not every system offers a modern REST API. Sometimes you work with SOAP, XML-RPC, FTP exports or even CSV files that appear on a shared drive. We connect with these older systems too and translate the data into a modern format that the rest of your landscape understands.
On our API integrations hub you will find detailed guides for specific systems: Exact Online, Shopify, Stripe, Bol.com, HubSpot and more. Each with use cases, technical approach and pricing indication.
Building an integration is step one. But APIs change: vendors deprecate endpoints, add mandatory fields or change authentication methods. Without active maintenance your integration will silently break one day, and you only notice when orders stop coming in or invoices are not sent.
We monitor integrations with automated health checks that run every five minutes. When a sync fails, you receive an immediate notification with context: which record, which error, which system. That saves hours of searching and prevents problems from going unnoticed for days.
For clients with business-critical integrations we offer an SLA with guaranteed response times. That means when Exact Online rolls out a breaking change at 03:00 at night, we have a fix for it the same morning. Your team does not need to worry about it.
Do you have integrations built by a previous party that no longer work reliably? We migrate them to a maintainable, tested and monitored system.
We reverse-engineer the current integration: which data flows where, which transformations are applied, which edge cases are covered and which are not.
Based on the analysis we design a new integration with clear error handling, logging and monitoring. We incorporate lessons from what went wrong with the old integration.
The new integration runs alongside the old one first. We compare the output of both systems to verify the new integration produces identical results before switching.
After validation we switch to the new integration with intensive monitoring in the first two weeks. The old integration remains available as fallback until everything runs stable.
We use modern tools for reliable, maintainable integrations.
React / Next.js
Web & frontend
React Native
Cross-platform mobile
Node.js / Bun
Backend & APIs
PostgreSQL
Relational data
Supabase
Auth, storage, realtime
Vercel / AWS
Hosting & CDN
Stripe / Mollie
Payments
OpenAI / LLMs
AI integrations
You talk directly to the developers working on your project. No project manager filtering or slowing information.
You own the code. Repositories, credentials and documentation are handed over. No vendor lock-in.
Based in Haarlem with clients across the Netherlands. No timezone issues, no language barriers.
From database design to deployment: we deliver the full journey. No external UX agency or third-party QA needed.
Read more about our services and browse integration guides for specific platforms.
We have experience with ERP (Exact, SAP, Dynamics), CRM (HubSpot, Salesforce), e-commerce (Shopify, WooCommerce, Bol.com), payments (Stripe, Mollie) and more. See /api-koppelingen for specific guides.
A standard integration with good API documentation can ship in a few weeks. More complex integrations with legacy systems, data migration or real-time sync take longer. We always provide an estimate after the discovery phase.
We look for alternatives: file-based imports, webhooks, screen scraping as a last resort, or we help the vendor build an API. There is almost always a way.
All integrations use encrypted connections (TLS), OAuth 2.0 or API keys with correct scope. Sensitive credentials are stored in vaults, never in code.
Yes. We build both batch synchronisation (periodic) and real-time (webhooks, event-driven) depending on the use case and source system.
Investment depends on the number of systems, complexity of data flows and desired reliability level. Use the calculator at /calculator for a first range.
There is no theoretical limit. In practice it depends on architecture and data volume. We design integrations modularly so you can add systems step by step without destabilising the whole. Whether it is two or twenty systems, the approach scales.
API changes are inevitable. That is why we build in versioning and actively monitor endpoints. For breaking changes you receive a proactive notification and we schedule the adjustment before it causes issues. This prevents surprises in production.
Yes, both one-time migrations and ongoing synchronisation. We map data structures, validate completeness and test thoroughly before anything goes to production. For large volumes we work with batches and fallback scenarios.
We can work with platforms like Make, Zapier or Workato if that fits your situation. Often though we prefer building custom because custom integrations are more reliable at high volumes or with complex logic. We give honest advice on what fits best.
We use automated tests on every integration, run scenarios in sandbox environments and perform load tests to verify behaviour under pressure. Only when everything runs stable in a test environment do we go to production.
We build in monitoring and alerting so problems surface quickly. In case of an outage there is a clear rollback plan and stakeholders are informed immediately. We also log everything so we can identify the root cause quickly and fix it structurally.
Tell us which systems you want to connect. We analyse your situation and provide a concrete proposal.