As the end of maintenance for SAP PI/PO looms in 2027, Swiss companies face what seems like a predetermined choice: migrate to the SAP Integration Suite or risk significant operational disruptions. Yet this deadline represents a strategic opportunity to break free from vendor lock-in and build a modular, API-driven, sovereign IT architecture.
Open-source solutions—from event buses to low-code orchestrators and modern ESBs—offer a license-free alternative perfectly suited to complex ERP, MES, CRM, or IoT workflows. This article analyzes the flaws of closed ecosystems, highlights mature open-source orchestrators, presents the benefits of custom middleware, and compares migration scenarios to illuminate a coherent integration strategy.
Limitations of Proprietary Ecosystems and the Temptation of Lock-In
Proprietary platforms lock organizations into heavy, costly technology dependencies. The lack of transparency in integration logic hampers agility and system control.
Centralizing iFlows and services within a closed tool can generate unexpected costs and delay upgrades. With each new version, complexity and migration fees rise, often without visibility into the underlying dependencies. An excessive reliance on a single vendor forces you to accept restrictive licensing terms and undergo standard updates that rarely align with business needs.
Rising Costs and Long-Term Dependencies
Vendors’ pricing models impose upfront and recurring fees for access to advanced features and partner connectors. These costs can account for a significant portion of the annual IT budget, reducing headroom for other projects. In the medium term, license renewals or the purchase of additional modules can weigh heavily on overall TCO, especially since changes in data volumes or transaction counts often trigger price reassessments.
For example, a medium-sized Swiss mechanical manufacturing company saw its licensing expenses rise by 40% over three years on its proprietary middleware. This extra cost constrained budgets for supply chain optimization projects, highlighting the direct financial impact of vendor lock-in.
This situation underlines the need to evaluate a move to open-source solutions today, where the absence of licensing fees enables reliable budget planning and directs resources toward innovation rather than fixed costs.
Lack of Transparency and Loss of Control
Within a closed platform, message-processing logic is encapsulated in inaccessible proprietary components. IT teams often cannot audit internal processes, complicating traceability and debugging during incidents. Detailed logs and custom metrics are frequently restricted, limiting the ability to diagnose performance or stability issues quickly.
As a result, support operations frequently require vendor intervention or certified consultants, significantly extending resolution times. The lack of source code access also prevents adapting connectors or fine-tuning workflows, forcing reliance on makeshift and unstable workarounds.
This opacity hinders the upskilling of internal teams and creates a critical dependency, directly at odds with goals of technological sovereignty and robust governance.
Barriers to Innovation and Rigidity
Deploying new features or adding external connectors follows development cycles defined by the vendor—often too slow to meet business requirements. Customization is limited to provided options, sometimes requiring complex off-platform development or accepting workaround solutions.
For instance, a Swiss logistics provider had to create an external microservice to send real-time IoT data to its ERP due to the lack of a native connector in its middleware. This approach added latency and complicated maintenance, demonstrating how proprietary platform rigidity can hinder operational optimization initiatives.
Without the flexibility of an open or custom solution, critical processes risk longer delays and incomplete functionality, directly impacting a company’s competitiveness and responsiveness.
The Rise of Open-Source Orchestrators and Their Industrial Maturity
Open-source solutions deliver integration capabilities on par with proprietary platforms, without licensing fees. These tools have now been proven in production within large-scale, mission-critical environments.
The open ecosystem includes ESBs, event buses, and low-code instances capable of handling even the most demanding data flows. Their growing adoption in industrial, financial, and supply chain sectors attests to their robustness and performance. With active communities and transparent roadmaps, updates and security are managed collaboratively and predictably.
ESB and API Management with WSO2 and Camel
WSO2 Enterprise Integrator and Apache Camel are two pillars of open-source integration. WSO2 offers a lightweight runtime and an integrated API Manager, suited for advanced orchestration processes. Camel, on the other hand, provides a message-routing framework with connectors for dozens of protocols and formats.
Both solutions integrate seamlessly into a Kubernetes environment, ensuring horizontal scalability and automated deployment. Companies can quickly create and deploy custom iFlows or Routes while benefiting from detailed logs and centralized governance tailored to compliance requirements.
These open-source ESBs are already used by Swiss manufacturing players to synchronize their ERPs, MES, and IoT clouds, demonstrating industrial-scale reliability and significant reductions in operating costs.
Event-Driven Architectures with Kafka and Kafka Connect
Apache Kafka, combined with Kafka Connect and Kafka Streams, forms the backbone of an event bus capable of processing millions of messages per second. This event-driven architecture meets the real-time integration and resilience demands of production lines and e-commerce platforms.
With Kafka Connect, sources such as ERP, CRM, or databases can be natively linked without heavy code development. Kafka Streams provides continuous processing and aggregation, enabling, for example, real-time KPI calculations or the triggering of automated workflows.
A Swiss logistics company uses this pattern to centralize all data from scanning terminals, ERPs, and tracking platforms, proving that an open-source event-driven architecture can rival proprietary offerings while ensuring unmatched elasticity and durability.
Low-Code Orchestrators and BPMN: n8n, Node-RED, and Camunda
Low-code orchestrators like n8n and Node-RED simplify the rapid setup of non-critical workflows while remaining extensible via JavaScript. Their visual interface accelerates iteration and reduces onboarding time for business teams.
Open-source BPMN engines such as Camunda or Flowable enable orchestration of complex business processes, from customer order to invoicing. Their compliance with the BPMN 2.0 standard ensures model portability and interoperability with other solutions.
A Swiss B2B services institute replaced a proprietary HR process management module with Camunda, cutting modeling and deployment time for new workflows by 60%. This example demonstrates that open-source orchestrators combine agility and robustness for automating critical processes.
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The Advantages of Custom Middleware for Sovereign Integration
An in-house or expert partner–developed solution perfectly aligns with business needs without any dependencies. It offers full control over logic, performance, and data handling.
Unlike off-the-shelf platforms, custom middleware relies on microservices orchestrated via Node.js, Nest.js, or Go, with an API Gateway and message queues. This modular architecture reinforces company sovereignty and simplifies application evolution based on business priorities without waiting for a third-party vendor’s development cycle. It can include workers for batch processing and queues to ensure resilience during traffic peaks.
Precise Alignment with Business Needs
The custom integration layer is designed to reflect actual workflows: data validation, enrichment, specific transformations, and granular orchestration. Each API and worker corresponds to a defined use case, optimizing latency and eliminating unnecessary code. Documentation, versioning, and quality constraints can be adjusted to internal standards, ensuring maintainability and complete transparency.
A Swiss distribution company assigned one of its teams to develop custom middleware to handle seasonal peaks. The result was a 50% reduction in order processing times and a major drop in synchronization errors between ERP and WMS, demonstrating that business-precise alignment translates directly into operational efficiency.
This approach fosters collaboration among architects, developers, and business stakeholders, ensuring continuous alignment between strategic objectives and technical features.
Extensibility, Scalability, and Resilience
Microservices enable easy horizontal scaling: each component can be resized independently according to load or flow importance. Workers handle asynchronous tasks without blocking synchronous APIs, while queues provide buffering in cases of sudden traffic surges or temporary downstream service failures.
Canary or blue-green deployments release new versions without service interruption, and independent versioning of each service minimizes the risk of breaks. Detailed, structured logs, exposed metrics, and customizable dashboards ensure proactive monitoring and rapid anomaly response.
This fine-grained infrastructure resilience ensures business continuity even during unexpected activity spikes or third-party component failures.
Data Openness and AI Readiness
A custom architecture natively exposes logs, events, and data streams to BI and AI solutions. Pipelines can feed data lakes, Power BI dashboards, or Spark clusters without relying on limited proprietary connectors.
Real-time data availability simplifies the implementation of autonomous agents, predictive scoring, or contextual recommendations, paving the way for advanced use cases. Models can consume events directly from Kafka or RabbitMQ queues, streamlining AI proof-of-concept development.
A Swiss retail player implemented a stock forecasting engine using streaming integration data, reducing out-of-stocks by 30% and improving product turnover—demonstrating that full data control unlocks new value opportunities.
Migration Scenarios and Strategic Choices for IT Integration
Multiple migration options coexist, each addressing different priorities in terms of budget, control, and deployment speed. The choice should be based on IT governance analysis, internal skills, and long-term ambitions.
The first scenario involves migrating to SAP Integration Suite, ensuring quick functional continuity but reinforcing lock-in. The second entails switching to a set of open-source tools to cut license costs and gain flexibility, while requiring robust IT governance. The third opts for custom middleware, maximizing sovereignty and adaptability at the expense of greater initial expertise needs and investment.
Migrating to SAP Integration Suite
This option provides facilitated modernization with native tools for API management, mapping, and monitoring. Teams familiar with the SAP ecosystem retain their workflows, and deployments benefit from vendor support. However, license costs remain high, and control over logs and internal logic stays limited.
Updates follow SAP’s schedule, and proprietary extensions can become obsolete if they don’t keep pace with platform evolution. The five-year TCO may thus exceed that of an open-source ecosystem or custom middleware.
For a company with limited internal integration resources, this solution may be relevant, provided it accepts reinforced vendor lock-in and reduced visibility into the technology stack.
Migrating to an Open-Source Ecosystem
Adopting free tools such as Apache Camel, Kafka, or WSO2 eliminates licensing costs and offers strong modularity. Communities provide support, plugins, and regular updates, while internal IT governance ensures coherence and security.
The middleware becomes an assembly of proven building blocks, facilitating evolution and monitoring.
Developing Custom Middleware
From-scratch development allows aligning every component with business challenges and guarantees complete independence from vendors. The initial investment includes architecture design, service development, API Gateway implementation, and CI/CD deployment. Long-term benefits translate into controlled TCO, maximum agility, and native preparedness for AI and data projects.
Collaborating with an open-source architecture expert partner can mitigate risks and accelerate solution quality. Updates progress at a chosen pace, and each service can be refactored independently without global impact.
This approach is suitable for organizations ready to invest in strong technical skills and keen to ensure a reliable integration foundation to support their digital transformation in the long term.
Building Agile, Sovereign IT Integration
Open-source alternatives and custom development transcend the single choice of SAP Integration Suite. They offer evolutionary freedom, total control over integration processes, and optimal alignment with business needs. By comparing migration scenarios, decision-makers can choose the most relevant model based on their IT maturity, resources, and long-term ambitions.
Our experts are available to assess your context, define appropriate governance, and support you in deploying an API-driven, scalable architecture free from vendor lock-in. Together, let’s turn the end of SAP PI/PO maintenance into an opportunity for innovation and digital sovereignty.


















