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Senior software architecture · Engineering · Frankfurt

Technical ownership
for complex software.

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.

Request a senior→Discuss an initiative→

0+years in architecture and engineering

End-to-Endfrom architecture to production

DZ BankDeutsche BahnDeutsche PostAtruviaT-SystemsAmadeusSenacorCofinproFI-TSBMS Consulting

Where should accountability sit?

ReinforcementSenior architecture inside your teamAccountability stays with you.OwnershipA scoped project, delivered completeAccountability sits with Entwicklerherz.

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 point

Client projects

Responsibility in real enterprise systems

DZ Bank – KBMDZ Bank – KBMDZ Bank

KBM

Software architecture and Lead Engineering

Architecture and technical delivery for core components of a digital advisor and customer portal.

AngularKafkaOpenShiftGraphQL

Kafka Streams · GraphQL · OpenShift

Deutsche Post – Pension ServiceDeutsche Post – Pension ServiceDeutsche Post

Pension Service

Software architecture and Backend Engineering

Event and integration architecture for pension requests and information workflows.

Spring BootKafkaKubernetes

Hexagonal architecture · Kafka Streams · Kubernetes

// agent-assisted delivery

More delivery capacity – without automating responsibility.

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

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

Live

Verified 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

Live

International 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 / upstand

Live

Open standard and reference platform for portable professional profiles with peer verifications, JSON-LD, exports, REST, and consent-controlled MCP access.

openworkid.orgupstand.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

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

// Entwicklerherz Lab

Do not just talk about AI engineering. Build tools for it.

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 Lab
01Active Lab development Working prototype

Changeproof

Every merge with a verifiable record.

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.

  • Analyze ticket + Git diff
  • Map tests + risks
  • Create passport locally
Open CLI demo Source code on GitHub

Journal

Thinking from practice

August 20268 min

The requirement was unclear. The code is done anyway.

Coding agents don't eliminate unclear requirements. They eliminate the friction that used to make ambiguity visible.

March 202612 min

Reviewing AI Code Is a Different Job.

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.

July 202612 min

Responsibility doesn't scale

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.

All articles

// next step

Let us clarify the right scope.

A short description of the system, bottleneck, and desired outcome is enough for an initial assessment.

Discuss the starting point →