| TECHNOLOGIEARCHITEKTUR | ADM Phase D |
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| Praesentation |
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| Anwendungsschicht |
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| Datenhaltung |
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| Externe Systeme |
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| UI Frontend (Web Application) |
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| Documentation App |
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| Process App |
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| Reporting App |
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| Communication App |
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| API Gateway (Auth, Routing) |
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| Relationale Datenbank |
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| ERP / Accounting System (e.g. SAP, DATEV) |
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| CRM / DMS (e.g. SharePoint, Salesforce) |
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| BZSt / eVatR API (VAT-ID Validation) |
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| Tax Filing Portal (e.g. ELSTER) |
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