DevelopmentUI/UX
VenturePlan
AI-powered business planning platform built specifically for the German market — from financial modeling to polished PDF exports.
Designer & Developer
Leif Rönfeldt
Crafting distinctive digital experiences at the intersection of design precision and technical excellence.
View ProjectsSelected Work
A curated selection of projects across design, development, and strategy.
WebdesignBranding
RetroBrain R&D
New corporate design and website for a developer of therapeutic video games for dementia patients.
Webdesign
Contact & Cooperation
Concept and implementation of the website for a student consulting organization.
My Current Stack
The tools and technologies I reach for every day.
Design
Sketch
Code Editor
Cursor + Claude Code
Frontend
Next.js
Backend
Next.js / Express
Deployment
Dokploy on Hostinger / Vercel
Favorite LLM
Opus 4.6 for Research & UI · Composer 2 for Code
Get in Touch
Have a project in mind or just want to connect? I'd love to hear from you.