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Freelance UI engineer with 15+ years of experience.

I help your team design and build digital products in the age of AI.

I join your team for a few days a week, from first prototype to shipped interface. Or I set up Claude in six weeks, so your team builds prototypes in its own design system.

Book an intro call or hallo@timhartmann.eu

Finance

  • Deutsche BankDetails to follow
  • BVVDetails to follow

Insurance

  • R+VDetails to follow
  • WertgarantieDetails to follow

Tax

  • DATEVDetails to follow
  • smartsteuerDetails to follow

Food

  • PottsalatDetails to follow
  • HensslerDetails to follow

Publishing

  • HogrefeDetails to follow
  • LandwirtschaftsverlagDetails to follow

  1. Broffee

    I built my own app idea. An app for every home barista.

  2. HRPuls

    Redesign of the entire web app

Testimonials

„With his honest manner he enriches discussions, does not shy away from any changes and always makes sure that we put the user in focus.“
Björn WaideCEO, smartsteuer GmbH

Services

  • Companies€960 / day

    Part of your team.

    You book me for a few days a week or a month. I work in your tools and your repo, design and frontend from one person. Then I step out again.

    See how it works

  • AgenciesBy arrangement

    Capacity when you need it.

    You have more projects than people. I work with your client under your name, for as long as you need me.

    See how it works

  • Product€24,999 fixed

    AI prototyping in 6 weeks.

    Your team builds prototypes with Claude, in your own look and feel. I turn your code, Figma files and docs into a workspace and show your team how to use it.

    Explore AI prototyping

Compare all services

Want me on board, or get to know each other first? Book an intro call or send me an email.