I build software — with AI tools like Claude Opus 5.
I am Ronny Glotzbach, a freelance developer based in Cologne, Germany. I build software and websites — mostly on my own, so you get one accountable person instead of an agency. Packages start at €700, the complete base is €2,100. If you would rather bill by time, that is €80 per hour — for projects as well as coaching.
Who I am
Most of the time I work alone — a direct line, one accountable person, no apparatus in between. Alone does not mean isolated: around me is a network of developers, designers and people from art and industry that I bring in when a project grows. We Do Fun Stuff came out of exactly that circle.
What I build is for the web: booking systems, automations, websites. When I am not building, I take photographs, read too much, do sport, and think best on paper. I write about it here — slowly, and only when I have something to say.
Projects
- 2023—2026
Psychofit
Technical co-founder. Owned the entire technical side: architecture, data model, implementation, deployment and operations — much of it done agentically with Claude Code.
- 2026
We Do Fun Stuff
Concept, architecture, design direction and build direction; implemented agentically with Claude Code against a briefing I wrote.
- 2026
ArtifAIry
Concept, curation, architecture and build direction; implemented agentically with Claude Code.
- 2026
Barrierefreies Umfrage-Tool
Developer in a two-person team: technical research, architecture decisions across the stack, empirical infrastructure sizing, frontend and speech microservices; implementation AI-assisted.Youth-welfare organisation
- 2025—2026
Sprachnachricht wird E-Mail
Concept and delivery as a freelancer; implementation AI-assisted.Mid-sized company
- 2025—2026
Zwei Element-Bibliotheken für WordPress
Specified, decided, tested and integrated — on an existing codebase, from provided design templates; implementation AI-assisted.B2B client projects
Working with me
Software & websites
I build your project — from the idea to going live. One point of contact, clear communication, modern tools. If it grows, I bring in my network.
- Design · Backend · Frontend
- €700 / block
- Complete base
- €2,100
- Or by the hour
- €80 / hour
Or tailored, after we talk.
1:1 coaching
We work on your real problem together — Claude Code, ChatGPT, Codex. Not a course, not a retainer. What I write here stays free.