26.10.2026 aktualisiert
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100 % verfügbarFull-Stack Developer & Ex-Fintech CTO | Python, Ruby on Rails, AI/LLM, SaaS & APIs
Münster-Sarmsheim, Deutschland
Weltweit
-Über mich
I build web apps from idea to production. Former CTO & co-founder of fairr.de (now part of Raisin SE), with 15+ years of full-stack experience in Python, Ruby on Rails & PHP. Specialized in SaaS, AI/LLM integrations, APIs & MVPs. Fully remote, fast and independent.
Skills
AI AgentsLLMAPIsSaasPythonRuby On RailsRubyBackendFront EndFintech
Custom Web Apps & SaaS – From Idea to Production
End-to-end delivery: concept, data model, backend, frontend, deployment. Focus on fast MVPs and business tools built to scale. 30+ projects shipped, multiple startups co-built from zero.
✨ AI & LLM Integration
Production RAG systems and LLM features (incl. POMA AI). AI agents, chatbots, document processing and workflow automation with OpenAI, Claude and LangChain, integrated into real products, not demos.
AI Automation (n8n, Zapier, Make)
1+ year of n8n in production, 30+ custom nodes built. Automated document flows, data syncing and API-driven processes.
Ruby on Rails
10+ years of production Rails, including a regulated fintech platform with strict requirements for stability, security and data protection.
Python
Backend services (FastAPI), data pipelines, AI/LLM applications and financial tools, e.g. a strategic asset allocation tool built with a fund manager.
TypeScript & Frontend
React, Next.js, Node.js – modern, maintainable frontends and full-stack apps.
API Integrations & Hotel Tech
REST APIs, webhooks, OAuth – connecting PMS, finance and accounting systems. Built and published my own app in the apaleo Store: Petty Cash App for Apaleo (cash book straight from the PMS for DACH hotels).
Full-Stack & Software Architecture
Ownership across frontend, backend and infrastructure (PostgreSQL, AWS). Maintainable, scalable systems with trunk-based development and CI/CD. Pragmatic, no over-engineering.
FinTech Expertise
Co-Founder & CTO of fairr.de (digital retirement savings), now part of Raisin SE. Hands-on experience with regulation, security and complex financial domain logic.
Founder & CTO Mindset
Serial founder, currently running AGI Research GmbH. Technical strategy, product development and team building in early-stage startups. I solve your business problem, not just the ticket.
Erfahrung
Berufserfahrungmehr als 10 Jahre
Freelancer seit2008
Sprachen
DeutschMutterspracheEnglischverhandlungssicher
Projekthistorie
Gruender der AGI Research GmbH. Tech-Unternehmer mit Fokus auf Finance und Entwicklung skalierbarer Tools.
Taetigkeit als Software-Developer ueber einen Zeitraum von ca. 5 Jahren und 9 Monaten.
Co-Gruender und CTO bei fairr.de in Berlin. Das Unternehmen ist heute Teil von Raisin SE.