Hello. I am Stefan, a freelance software developer with more than 25 years of professional experience, based in Berlin.
Are you looking for help? I'm available for contract work with React.js, Node.js, TypeScript, and AI-based coding.
Experience
I have spent the last 9 years working with React.js, Node.js, and TypeScript for enterprise scale customers and startups. Before that, I have worked with C++, Java, and Ruby on Rails for many years.
I have more than 25 years of professional experience. I have co-founded two companies, worked as a CTO, team lead, and lead developer, and have written two books about Java. I have coached individuals and teams. I am also a Certified Scrum Master.
In recent projects I use agentic coding tools like Claude Code and Cursor to ship features faster.
Skills
Customers
- Zalando
- O2
- HRS
- SAP
- Movinga
- Kühne + Nagel
- Reuters
- Fyber
- Postbank
- HERE
- Intersection
- Commerzbank
Testimonials
I have some customer testimonials on LinkedIn.
Code
See some of my code on GitHub:
GitHubAvailability
From March 1, 2026 I will be available for React, Node.js, TypeScript, and AI-based coding work as a contractor, remotely or in Berlin.