Case Study: How a Technical Service Provider with 180 Employees Regained Data Sovereignty

The discussion about digital sovereignty, the US CLOUD Act, and IT compliance is often conducted at a very theoretical level. However, the structured analysis of a transformation project at a technical service provider for plant maintenance and repair shows how urgent the need for action can become for medium-sized businesses.

With around 180 employees in the DACH region—most of them working in the field for various industrial companies—the company faced the challenge of making its established structures fit for the tightened market requirements. This case study documents the journey from a fragmented US-SaaS landscape to an integrated, sovereign business platform.

The Initial Situation: Functionally Stable, Strategically Vulnerable

For years, the company operated an IT setup commonly found in many medium-sized businesses. Without a large internal IT department for application development, they relied on readily available standard tools from the market:

• Communication & Office: Microsoft 365 (Teams, SharePoint, OneDrive)
• Customer Service & Support: Zendesk for ticketing incoming fault reports
• Contracts & Protocols: DocuSign for digitally signing maintenance reports in the field

From an operational perspective, this structure worked. Employees were familiar with the interfaces, and the administrative effort seemed minimal, as updates and maintenance were handled directly by the cloud providers.

The Turning Point: Regulatory Pressure from KRITIS Customers

The risk assessment changed fundamentally when several key customers from the energy and water sectors (KRITIS environment) presented detailed supplier questionnaires during their annual security audits.

The auditors’ core questions hit the sore spot of the established IT structure:

1. In which specific legal jurisdiction are the order-related maintenance protocols and network infrastructure sketches processed?
2. How is it technically and legally ensured that foreign authorities (e.g., via the US CLOUD Act) do not gain access to the internal data of the critical infrastructure?
3. What documented and tested exit strategy exists if a SaaS provider fails or no longer meets regulatory conditions?

The blanket answer that the data is located in the European data centers of US providers was no longer accepted by the auditors. A major customer explicitly tied the upcoming renewal of a multi-million euro framework contract to the condition that business-critical project data must be completely withdrawn from US cloud structures. Simultaneously, when the IT infrastructure partner announced a 25% price increase, the compliance issue became a strategic core decision.

The Transformation: Platform Thinking Instead of Logo Swapping

The project’s goal was not to replace individual software logos one-to-one. Instead, a consistent, deeply integrated overall architecture was to be created, operated entirely within the European legal framework, while maintaining the familiar comfort of modern cloud systems.

The new architectural foundation was built on Managed Open Source on a sovereign platform infrastructure in German data centers:

[Old Setup: US-SaaS Silos] –> Microsoft 365 | Zendesk | DocuSign v [New Setup: Sovereign Platform] –> Nextcloud / Mattermost / Zammad / Docuseal Orchestrated via a central IAM (Authentik)

1. Consolidation of Core Processes

• Communication & Exchange: Instead of MS Teams and SharePoint, Mattermost was introduced for real-time coordination in the field, and Nextcloud for versioned document storage.
• Service Desk: Zammad took over full ticketing, including SLA tracking and escalation logic.
• Digital Signature: Docuseal was directly integrated into the workflow to digitally sign maintenance protocols on-site without media disruption and in a legally secure manner.

2. Deep Process Integration

The decisive step away from mere tool swapping was linking the systems via standardized APIs. When a new maintenance order is received in Zammad, the platform automatically creates a corresponding project folder in Nextcloud and opens a temporary coordination channel for the technician team in Mattermost. Once the customer signs the protocol via Docuseal, the document is automatically transferred to the tamper-proof archive without manual intervention.

3. Central Protection through an IAM Layer

Across all applications, Authentik was deployed as a central identity management (Single Sign-On). Employees now use only one, MFA-protected access for all tools. If an employee leaves the company, access can be revoked across systems with a single click.

The Results: Measurable Success on All Levels

The complete migration of core applications was realized within a tight timeframe of six months. The impact on the company was profound:

• Contract Security & Compliance: The security audit of the KRITIS customers was passed flawlessly. The seamless data sovereignty is now technically and legally demonstrable, leading to the immediate renewal of the endangered framework contract.
• Drastic Cost Reduction: By eliminating the per-user licensed US-SaaS models and consolidating the infrastructure, annual software and operating costs were reduced by around 40%. Cost development is now decoupled from the number of employees and solely tied to the actual computing power used.
• High Employee Acceptance: As system disruptions and the constant entry of different passwords were eliminated, the new platform was quickly accepted by the team, especially in the mobile field service. The workflow runs more smoothly than in the old structure.

Conclusion: Sovereignty as a Business Enabler

This case study exemplifies that the exit from dependence on global US-SaaS monopolies is not merely a defensive protective measure for medium-sized businesses. Those who view the transformation not as a burdensome duty but as an opportunity for genuine platform thinking not only regain full control over their data. They enhance process efficiency, sustainably reduce operating costs, and create an irrefutable argument in B2B sales with demanding, regulated customers.

FAQ: Best Practices from the Migration Project

How was the migration of historical data handled?

For the project’s success, it was crucial that no historical project data was lost. The migration was carried out in phases: Using standardized API scripts, ticket histories were exported from Zendesk and structured into Zammad. Documents from SharePoint were automatically transferred to the new Nextcloud folder structure, preserving existing file versions and metadata.

Did the company have to hire new IT specialists for operation?

No. This was a prerequisite from management. The entire operation, monitoring, backups, and patch management of the open-source platform were transferred as a Managed Service to a specialized European partner. For the internal IT managers, the system feels as maintenance-free in everyday life as a conventional SaaS solution—but with the difference that data sovereignty remains entirely within the company.

Were there any downtimes during the transition phase?

By using modern Container architectures, the new platform could be built and tested in parallel with the existing SaaS structure. The actual switch of the live systems took place over a weekend. The following Monday, employees could seamlessly continue working in the new environment without interrupting ongoing customer service or field operations.