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Jomaha Studio

I build systems.

Quality lies in the detail.

Services

What I do

  1. 01 / Systems

    Software

    Shops, web apps and tools that replace manual work. Architecture first, then the build.

  2. 02 / Automation

    AI systems

    Agents, automations and the context they run on, set up so they reliably do the same thing.

  3. 03 / Care

    Maintenance

    Updates, monitoring and support, so what was built in year one still runs in year three.

I build software that serves a purpose. First the question of what it is for, then the code. Engineering and experience belong together, because a system only works if people want to use it.

Live demo: website, shop, AI and backend

Website, shop, AI and the backend behind them, as one system. Try it out.

Demo

Bike shop · TraunsteinBikes thatfit.Trekking, gravel and e-bikes, with a workshop in house. Chosen, set up and serviced by us.
New · Alpenrad 2027
11.2 kg1×12 Shimanofrom €1,290
Order a bike, ask the AI, then look in the admin tab.

Selected work

Systems in the wild

Some built alone, some with a team.
  • 01AI workspace

    An AI workspace with persistent project context.

  • 02Web & CMS

    The Metatrom website, on Next.js and Payload CMS.

  • 03Shop & marketing

    A Shopify store for a small jewellery label, plus the marketing.

  • 04Web & CMS

    The bilingual studio website, built on its own CMS.

Process

How a build runs

  1. 01

    Scoping

    Why first. Then what it covers, what it leaves out and what is still unclear.

  2. 02

    Building

    Short loops. You see it running early, not at the end.

  3. 03

    Proving

    Tests, load and the edge cases. Then it ships.

  4. 04

    Handing over

    Code, access and the reasoning behind every decision are yours, written down.

Engagements

Working together

Porträt von Jona Jell
Jona Jell, software and AI systems

About

I'm Jona.

I love building coherent systems, and purpose always comes first. Best of all with people who know what they want, and why.

Location
Chiemgau, Bavaria
Working
Remote, DE and EN
Response
Within two working days

How I work.

I take on few projects at a time. Each one gets the time it needs.

WorkloadAs of 10/2026

Next free start: January 2027

  • 6Years of software
  • 20+Projects
  • 1Point of contact

Contact

Let's talk.

A problem, a sketch or a question is enough.

Start a build

This website

Measured, not claimed.

Every decision behind this site is written down with its reasons. The numbers are measured on the live site.

Live · jomaha.studioLighthouse, desktop · 10/2026
  • 100Performance
  • 0.5 sLoad time (LCP)
  • 100Accessibility
  • 0Cookies
What's behind it

Fast

0 render-blocking requests. The headline waits for no script.

Secure

CSP, 2 years of HSTS and a rate-limited form.

Private

0 trackers. No analytics, no third-party scripts.

Made in Germany

Server, database and email, all in Germany.

Accessible

At least 4.5 : 1 contrast for every text colour, checked by tests.

Editable

Text changes need no deploy and go live from the admin.

Tested

Over 600 tests on every change.

Documented

20 decisions written down, with reasons and alternatives.

Machine-readable

Every page also as Markdown. Plus JSON-LD and /llms.txt.

Bilingual

German and English, linked by hreflang.

Lean

3D loads after the text and pauses off screen.