Connect your systems: integrations with custom ERP, APIs and middleware

What is Integration with existing ERP, APIs, and systems?

When a company's systems don't communicate with each other, the team ends up acting as human middleware: copying data between applications, generating reports by combining spreadsheets from different sources, correcting desynchronizations, and spending hours on tasks that a well-designed integration would solve automatically. At Q2BSTUDIO we develop custom integrations between ERPs, CRMs, e-commerce platforms, invoicing systems, logistics, HR and any application that exposes or can expose an API.

The process starts by mapping the current data flow: what systems exist, what data each handles, where there is overlap, which processes rely on data from multiple systems, and where the bottlenecks are due to lack of integration. From this map we define the integration architecture: point-to-point when we connect two specific systems, or through middleware or service bus when there are multiple systems that need to exchange data in a coordinated way.

Integrations are built on top of REST APIs, SOAP, GraphQL, webhooks, message queues, or system-specific protocols (such as OData for SAP or proprietary APIs for vertical ERP). When the system does not have APIs, we evaluate alternatives: shared database, exchange files, RPA or extensions of the system itself. We always prioritize the option that guarantees data integrity, traceability and long-term maintenance.

The most common scenarios include two-way synchronization of customers and contacts between CRM and ERP, automation of orders from e-commerce to logistics and invoicing, consolidation of sales data from multiple channels in a datawarehouse, synchronization of product catalog between ERP and online store, integration of HR with payroll and time control, and connection of web forms with CRM for incoming leads.

Each integration includes robust error handling: retries, dead letter queues, alerts and detailed logs so that when a message fails it is not silently lost but logged, notified and reprocessed. Production monitoring allows you to detect desynchronizations before they have an impact on the business.

The security of integrations is critical: authentication between systems, encryption of data in transit, rotation of credentials, principle of least privilege and access auditing. We never expose more data than necessary or grant more permissions than strictly required.

We develop integrations with Node.js, .NET or Python depending on the ecosystem, and deploy them in cloud infrastructure with CI/CD and monitoring. If data volume or criticality requires it, we deploy message queues with Azure Service Bus, RabbitMQ, or AWS SQS to decouple systems and ensure delivery.

We provide technical documentation of each integration, data flow diagrams, operation guide and ongoing support for maintenance, adaptation to changes in the integrated systems and expansion with new flows.

If the organization is evaluating new systems (ERP change, new e-commerce platform or CRM), we can design the integration to be adaptable to future change, avoiding rigid dependencies that force everything to be redone when a system is replaced.