
API Testing: Strategies & Tools for Reliable Interfaces
API Testing: Strategies and tools for reliable interfaces. Unit tests, integration tests, contract testing and load tests with Postman, Jest and k6.
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We connect your systems and apps into one IT landscape. Smart integration creates efficient workflows.
API Development & Integration
Development and integration of custom APIs.
ERP & CRM Integration
Connection of ERP and CRM systems.
IoT Integration
Connection of IoT devices and sensors.
Knowledge & Answers
System integration connects different software systems, databases, and platforms so they can exchange data and work together. Goal: automated processes instead of manual data transfer.
Yes, that's a classic. We synchronize customer and order data bidirectionally. Also other combinations: ERP with shop, CRM with marketing, PIM with marketplaces – we connect everything.

Identify integration potential?
We analyze your system landscape and show optimization potential.
Thorsten Frieling – Project Management
With more than 3 systems, usually yes – to avoid 'spaghetti architecture'. We advise on the right solution (ESB, iPaaS, custom middleware) depending on requirements and budget.
Depends on the use case. Real-time for critical processes (orders, stock), batch for less time-critical data (reports, master data sync). Often a mix of both makes sense.

Architecture advice needed?
We design the optimal integration architecture for your landscape.
Björn Groenewold – CEO
From a few days for standard APIs to months for complex enterprise landscapes. We usually start with a Proof of Concept to validate feasibility and effort.
We implement monitoring that reports errors. Data is buffered and retransmitted once the target system is available again. Full traceability and alerting.
Simple point-to-point from €5,000, complex enterprise integrations €50,000-200,000+. ROI is often reached within months through reduced manual work and fewer errors.
Usually within 6-18 months. Savings come from automated processes, fewer errors, faster reporting, and better data quality. We can calculate the business case with you.

Ready for seamlessly integrated systems?
Let's talk about connecting your IT landscape.
Thorsten Frieling – Project Management
Most enterprise IT landscapes are not monolithic systems but patchworks of specialized tools accumulated over years of organic growth. Your ERP handles finance, a separate CRM manages customer relationships, the warehouse runs its own software, and marketing uses yet another platform. Without proper integration, employees waste hours manually transferring data between these silos, errors multiply at every handoff point, and management lacks a unified view of business operations. System integration solves this by creating automated data highways between your critical applications.
We approach integration projects with an architecture-first mindset because poorly planned connections quickly devolve into an unmaintainable mess of point-to-point links. For enterprises with more than three interconnected systems, we typically recommend a middleware layer or integration platform that serves as a central hub for data routing, transformation, and monitoring. This hub-and-spoke model makes it straightforward to add new systems later without rewriting existing connections, dramatically reducing the long-term cost of keeping your IT landscape connected.
Real-time versus batch integration is a design decision that significantly impacts both cost and complexity. Order processing and inventory updates typically demand real-time synchronization through event-driven architectures, while master data synchronization and reporting can often run on scheduled intervals. We help you make these trade-offs by mapping each data flow to its actual business urgency, ensuring you invest in real-time capabilities only where they genuinely matter rather than over-engineering connections that could work perfectly well with hourly updates.
The value of system integration becomes tangible quickly: manual data entry errors drop to near zero, reports that previously took days to compile generate automatically, and your teams gain a single source of truth across all platforms. We have seen integration projects pay for themselves within six months through reduced labor costs and improved data quality alone. Our monitoring and alerting infrastructure ensures that data flows remain reliable around the clock, with automatic retry mechanisms and clear escalation paths for the rare situations when intervention is needed.
Frequently Asked Questions
We connect ERP, CRM, e-commerce and other systems via APIs or middleware. Data flows are automated, validated and monitored so you get one source of truth.
Simple point-to-point from around €10,000 excl. VAT; multi-system landscapes from €50,000–200,000+ excl. VAT. We scope after a short workshop and give a fixed or capped quote.
We design per flow: order and inventory often real-time; master data and reporting can be scheduled. We recommend what fits each business need.
We document flows and dependencies and can run monitoring and support. When source or target systems change, we update and test so integration stays reliable.

We scope after a short workshop and give a fixed or capped quote.
Book a callRelated Topics
Complementary Services from Other Areas
These services are frequently requested together with System Integration or complement it thematically.
Software & Platforms
Data, Analytics & Databases
Your Next Step
Tell us briefly what you have in mind.
We'll analyze your system landscape and identify integration options – with a clear focus on stability.
30 min strategy call – 100% free & non-binding
System Integration is most effective when it is aligned with your business goals, existing systems, and team capabilities. At Groenewold IT Solutions we combine product thinking, clear architecture, and hands-on delivery so that every project delivers measurable value. We address operational, compliance, and performance aspects early so that later releases stay on track.
Our approach to System Integration emphasises transparent backlogs, close collaboration with your stakeholders, and incremental delivery. Whether you need a discovery workshop, an MVP, or a full-scale implementation, we define scope, effort, and success criteria up front. With over 250 completed projects we have the experience to recommend the right level of investment and the right next steps for your situation.
Explore our services overview for the full portfolio, our topic pages for in-depth articles linked to each service, and the IT Glossary for key terms. If you would like to discuss your project, we are happy to clarify scope, priorities, and a realistic timeline in a short consultation.
Decision guidance
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Book a no-obligation call about your project – or start with our project check for a structured first assessment.
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API Testing: Strategies & Tools for Reliable Interfaces
API Testing: Strategies and tools for reliable interfaces. Unit tests, integration tests, contract testing and load tests with Postman, Jest and k6.
Read more