~/engineering
Senior software engineering with a pure startup mindset
Focused on web apps, pragmatic automations beyond n8n, and rapid prototyping — with an AI-first approach and twenty years of practice.
01 / stack
Preferred Tech stack
Backend
- Node.js
- TypeScript
- Python
- Supabase
- Message queues
Frontend
- Vue.js
- TypeScript
- Tailwind CSS
Data
- MySQL
- PostgreSQL
- Supabase
Infrastructure
- From bare metal to cloud-native
02 / how i work
Principles over buzzwords
AI-first approach
AI is part of my engineering workflow from architecture to review — used deliberately, with the experience to know when not to trust it.
Product-oriented mindset
I ask the right questions upfront. Code only matters if it moves the product and the business.
Continuous improvement
I improve legacy code while shipping new features — leaving every codebase better than I found it.
03 / proof
Things I had impact on
laserhub.com ↗
The procurement platform for custom metal parts I co-founded and built up as CTO.
ambrosius.ai ↗
An AI-driven product I build and run myself as a side hustle.
rhome.world ↗
The global mobility platform for workations, business travel and assignments — compliant & simple. I work on it as a Senior Full Stack Engineer.
tally-js ↗
A type-safe, developer-friendly TypeScript wrapper for the Tally.so API, published as an open-source npm package.
Local AI Email Archive ↗
Instant keyword + semantic search over twenty years of my own mail, in one Docker container that never phones home. Python, SQLite, Vue, and an MCP endpoint for AI assistants. Open source.
04 / scaling up
Larger software projects
When a project outgrows a single pair of hands, I don’t pretend otherwise. For larger software projects I collaborate with a Polish/Ukrainian software partner — a trusted partnership of almost ten years.
Highly skilled engineers with great collaboration and communication skills, and me as your single point of contact who speaks both tech and business.
05 / references
What others say
“As an engineering leader, Jonas drove initiatives that kept us reaching for smarter, state-of-the-art and long-lasting solutions. He was a fountain of ideas that kept things fresh and exciting — and always had an open ear, challenging input with the right questions to draw out even better ideas.”
“Jonas is a thoughtful engineering leader who puts people first. He has real technical depth and a sharp product sense. When he’s deciding something that matters, he takes the time to hear people out and dig past the easy answer. I learned a lot from his leadership. I’d work with him again in a heartbeat.”
Got something to build?
Tell me what you’re working on and I’ll tell you honestly whether I’m the right person for it.