I'm a frontend engineer in Denmark with a strong eye for UI and UX. I care about interfaces that feel calm and obvious: clean, minimal, mobile-first, with nothing on the screen that doesn't need to be there.
At YULSN I work as a full stack developer. I build the internal systems the team relies on and drive our work with AI and agents. Before that I was at Klimabiler, a startup focused on electric cars. I like sitting where design, engineering and the product meet.
Outside work I'm always building, mostly in React, Next.js and TypeScript, and more and more with AI agents. Elma is my own agent orchestration system.
I'm drawn to the same things in design as everywhere else: simple shapes, natural materials and well-made tools.
I take on freelance work. Write to me at info@byhartvig.dk.
Writing
Projects
- Rune-Wiki2026A free, unofficial companion for RuneScape: Dragonwilds, with a guide that starts where you are, an interactive map and 1,764 crafting recipes.
- IT Factory2026My control centre for small web projects on Cloudflare. It creates a project in about a minute and keeps it deployed, monitored and backed up.
Now
Building Rune-Wiki, a free fan-made guide to RuneScape: Dragonwilds, with an interactive map, quest guides and crafting tools.
Updated November 2026