// Projects & products
Projects & products
Client projects show work in large system landscapes. Active in-house products show full product ownership. Completed systems make additional technical breadth visible.
Client projects
Responsibility in real enterprise systems
DZ BankKBM
Software architecture and Lead Engineering
Architecture and technical delivery for core components of a digital advisor and customer portal.
Kafka Streams · GraphQL · OpenShift
Deutsche PostPension Service
Software architecture and Backend Engineering
Event and integration architecture for pension requests and information workflows.
Hexagonal architecture · Kafka Streams · Kubernetes
LBBCoBranding Platform
Software architecture and Engineering
Platform and integration architecture for multi-tenant credit card and partner processes.
Multi-tenant · Partner integrations · CI/CD
Deutsche BahnFASSI-MOVE
Application architecture and Engineering
Offline-capable application architecture for the mobile workplace in rail operations.
PWA · Offline capability · AWS integration
VisualVestRoboAdvisor
Application & Integration Engineering
Technical delivery of core application and integration flows in a regulated FinTech environment.
Robo-advice · eID verification · API integration
DZ BankGPdirekt
Software architecture and technical delivery
Technical delivery of business-critical onboarding and signature processes.
Digital onboarding · E-signature · Process integration
Active in-house products
Products under our own responsibility.
These products show which technologies and AI systems Entwicklerherz uses in production – and which experience transfers directly into client work.
Fachzirkel
LiveVerified professional platform for health practitioners with matching, marketplace, specialist groups, directories, and direct messaging.
- Technology & AI
- Next.jsPostgreSQLPasskeysStripeAzure OpenAIPWA
- Transferable experience
- Trust and privacy are designed as system properties through robust verification, clear roles, and controlled account lifecycles. Azure OpenAI within a European data boundary supports GDPR-compliant AI processing.
SchemaCommunity
LiveInternational professional community for schema therapy with profiles, directories, forums, events, messaging, and institute affiliations.
- Technology & AI
- Next.jsPostgreSQLPrismaAzure OpenAIGPT-4o mini8 languagesPWA
- Transferable experience
- Multilingual communities need a consistent domain model for roles and affiliations. Azure OpenAI keeps sensitive AI processing within a European data boundary, while approvals and data quality remain controlled for GDPR-compliant operations.
openworkid / person.work
LiveOpen standard and reference platform for portable professional profiles with peer verifications, JSON-LD, exports, REST, and consent-controlled MCP access.
openworkid.orgperson.work
- Technology & AI
- JSON-LDNext.jsSupabase/PostgreSQLGPT-4oOAuthPasskeysRESTMCP
- Transferable experience
- AI accelerates structuring and drafting; identity, permissions, and verified facts remain deterministic. Open standards and OAuth-protected MCP interfaces preserve portability and auditable access.
Completed product systems
Anzeigenpilot, SchemaPath, and Therapendo were fully implemented but are no longer operated as businesses. They demonstrate additional architecture, product, and integration work.
Anzeigenpilot
Multi-Role Marketplace · AI Vision · Storefronts · Search · Messaging · Stripe Connect
Archived
Anzeigenpilot was a complete commerce platform, not merely an AI listing generator. Sellers turned clothing photos into listings, managed inventory, and grouped items in personal closets or time-limited drops. Buyers searched items and sellers, maintained wishlists, asked questions, and completed purchases through integrated communication and payment workflows.
ArchitectureNext.js 16 · PostgreSQL/Supabase · role and permission model · OpenAI Vision · search and wishlists · messaging workflows · Stripe Connect · OAuth 2.0 with PKCE · MCP
SchemaPath
Multi-Role Platform · Practice Management · Secure Messaging · Assignments · Journaling · Therapy Workflows
Archived
SchemaPath combined practice management and digital schema therapy in one shared role and process model. Therapists managed patients, appointments, and groups, communicated securely, and assigned tasks, materials, exercises, and learning sets. Patients used journals, mode tracking, messaging, and interactive content between sessions; activity and progress flowed back into the therapeutic overview.
ArchitectureNext.js 16 · PostgreSQL/Supabase · role-based access · WebAuthn · calendar and group workflows · messaging and assignments · modular exercise and learning-set engine · Azure OpenAI · 7 languages
Therapendo
Website Builder · Multi-Tenant · Publishing · Custom Domains · E2E Encryption · Stripe
Archived
Therapendo guided healthcare practices from template selection to a published website. Content could be edited directly without technical expertise; hosting, a Therapendo subdomain or custom domain, and contact forms were integrated. Patient inquiries could be delivered to the practice with end-to-end encryption.
ArchitectureNext.js 16 · PostgreSQL/Supabase with row level security · TipTap/MDX · template and publishing engine · custom domains · X25519 + XSalsa20-Poly1305 · Stripe · 29 languages
Which technical constraint should be solved next?
A short description of the system, the current situation, and the required outcome is enough for an initial assessment.