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  • Engineering Manager
  • AI Platform
  • Freelance Developer

I build AI products, apps and websites for founders and teams, from the first prototype to the thing people actually use.

15+Years experience
15+Side projects
100k+Total downloads

What I do

AI in production, apps in the stores, sites people own

  1. Mobile apps in Flutter

    My own apps, built with Flutter and Firebase and shipped to the stores. MealMate is still live.

    MealMate: Protein Meal Plan

  2. MLOps and AI platforms

    My day job: the platform at Sixt that gets models out of notebooks and into production.

    1. ML platform architecture

      the training, deployment and monitoring path a team uses daily, not a single pipeline that works once

    2. Prototype to production

      taking a model that runs on a laptop and making it something an on-call engineer can be woken up for

    3. AI features inside a product that already exists

      scoped so the useful part ships before the budget is gone

    4. Direction for a team already building it

      architecture, tooling, and the handful of decisions that are expensive to reverse

  3. Websites and brand identity

    Identity, design and build for people whose name is the business. When we are done, you own all of it.

  4. Technical leadership

    I lead a team of ML and MLOps engineers, and help other teams with the decisions that are expensive to undo.

von Wartenberg Leadership home page: the claim “Learn to Serve & Protect” over a deep navy heroMealMate Home ScreenThe same home page on a phoneThe about page introducing Dr. Peter von Wartenberg
Client websites

Websites for people whose name is the business

Freelance, end to end: brand identity and logo through to a running site with a CMS, a blog and a newsletter behind it, handed over so you can keep changing it without me.

  • Brand & corporate design

    Logo, palette, type and motion: the identity before the site.

  • A site you own

    Pages, blog and newsletter in a CMS with your name on it.

  • Guardrails, not handcuffs

    Security, speed and correctness, checked automatically.

  • Handover that survives me

    A codebase where you can change copy and colour without me.

  • Next.js
  • Tailwind CSS
  • TypeScript
  • Payload CMS
  • Neon Postgres
  • Brevo
  • Vercel
The brand page explaining the Rising Arcs mark and its four levelsThe three level pages (Mein Selbst, Mein Team, Mein Business), each lighting a different arc of the mark: inner, middle, outer

src/components/ui/button.tsx, lines 41-48

    variants: {
      variant: {
        primary: 'bg-acc text-on-light',
        ghost:
          'bg-transparent text-fg ring-1 ring-inset ring-white/[0.12] hover:bg-white/[0.03] hover:ring-white/[0.24]',
        secondary:
          'bg-transparent text-fg ring-1 ring-inset ring-white/[0.12] hover:bg-white/[0.03] hover:ring-white/[0.24]',
      },
src/components/ui/button.tsx, lines 41-48

Tell me about your project

A website and brand you own outright, an app, or help getting machine learning into production. Write a few lines about it and I'll tell you honestly whether I'm the right fit.