Senior software architecture · Engineering · Frankfurt
Entwicklerherz strengthens project teams – or owns clearly bounded software initiatives end-to-end.
Inside your team or end-to-end for a clearly bounded software initiative.
AI agents accelerate delivery. Architecture, review, and approval remain in experienced hands.
AI agents accelerate delivery. Architecture and approval remain in experienced hands.
0+years in architecture and engineering
End-to-Endfrom architecture to production
Not sure which mode fits? A short system and architecture clarification makes the goal, risks, and sensible scope visible before a larger engagement begins.
Discuss the starting pointClient projects
DZ BankSoftware architecture and Lead Engineering
Architecture and technical delivery for core components of a digital advisor and customer portal.
Kafka Streams · GraphQL · OpenShift
Deutsche PostSoftware architecture and Backend Engineering
Event and integration architecture for pension requests and information workflows.
Hexagonal architecture · Kafka Streams · Kubernetes
// agent-assisted delivery
Entwicklerherz orchestrates specialized AI agents for code analysis, implementation, tests, and documentation. The agents operate within a clear technical frame; an experienced software architect holds context, decisions, and outcome together.
AI agents handle code analysis, implementation, tests, and documentation – within a clear technical frame.
You are not hiring an autonomous bot team. You work with one accountable senior engineer whose delivery capacity is extended by agents.
No autonomous bot team: you work with one accountable senior engineer.
Active in-house products
These products show which technologies and AI systems Entwicklerherz uses in production – and which experience transfers directly into client work.
Verified professional platform for health practitioners with matching, marketplace, specialist groups, directories, and direct messaging.
International professional community for schema therapy with profiles, directories, forums, events, messaging, and institute affiliations.
A non-commercial Career Record for experienced freelancers. Their own agent maintains it through MCP; web, PDF, and JSON stay in sync.
person.workopenworkid.org
Completed product systems
Multi-Role Marketplace · AI Vision · Storefronts · Search · Messaging · Stripe Connect
ArchivedAnzeigenpilot 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
Multi-Role Platform · Practice Management · Secure Messaging · Assignments · Journaling · Therapy Workflows
ArchivedSchemaPath 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
Website Builder · Multi-Tenant · Publishing · Custom Domains · E2E Encryption · Stripe
ArchivedTherapendo 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
// Entwicklerherz Lab
The Lab creates engineering tools with a clearly stated maturity level. Changeproof is a working prototype tested against real codebases – not yet an independent product.
Visit Entwicklerherz LabChangeproof
The Changeproof CLI analyzes a Git diff together with a ticket or specification. It creates a local Change Passport that maps requirements to changed files and tests, exposes open risks, and adds a verifiable integrity hash.
Reviewers get one artifact showing what was intended, what changed, which evidence exists, and what remains open before approval.
intentrequirement fixed✓changeGit change measured✓evidenceevidence connected✓integrityintegrity verifiable✓Journal
Coding agents don't eliminate unclear requirements. They eliminate the friction that used to make ambiguity visible.
AI code looks clean. But whether it fits the system can't be seen in the diff — only when you know what to check against.
Output can be parallelized, understanding can't. Why organizations are quietly converting responsibility into risk right now — and why it only surfaces when something breaks.
// next step
A short description of the system, bottleneck, and desired outcome is enough for an initial assessment.