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A development team from Vellberg in Baden-Württemberg. We design, build and run apps, websites and software: our own products and projects for our clients.

Who is behind it

Hauck and Kellermann. The name joins the surnames of the two founders. Since 1 January 2024 we have worked as Haukel GbR.

  • Marc HauckManaging partner
  • Jan KellermannManaging partner
Marc Hauck and Jan Kellermann side by side, black-and-white photo
Marc and Jan, September 2026.
Half-timbered houses on the market square of Vellberg at blue hour, with a lit church tower behind them
HomeVellberg.
Photo: Roman Eisele, CC BY-SA 4.0
Vellberg in the district of Schwäbisch Hall, Baden-Württemberg.
First mentioned
3 May 1102
Residents
4,728 at the end of 2025
Location
375 m up on the Bühler, eleven kilometres from Schwäbisch Hall

What we do

Four disciplines, one team. Design, app, website, backend and operations from one place.

  • Apps

    iOS and Android with React Native and Expo. Widgets, Live Activities and store releases included.

  • Websites

    Fast, multilingual and server-rendered. From a company site to a full web app.

  • Software

    Backends, APIs and internal tools in Go and C#. Built to run reliably.

  • AI

    AI features for your product: moderation, translation, summaries. Properly integrated, with a fallback.

How we work

  • Everything from one place.

    Design, app, website, backend and operations. One point of contact instead of an agency, freelancers and a host.

  • Our own products as a workshop.

    Our apps run with real users. What we learn from running them flows into every client project.

  • Multilingual from the start.

    Our products run in up to 14 languages, our website in six.

  • Operations included.

    What we build, we keep running: updates, monitoring and maintenance for as long as the product lives.

  • Thorough rather than loud.

    Tests, accessibility and clean handovers are part of the work, not an extra.

How we got here

A few more products every year, all still running.

  1. 2023

    Marc Hauck and Jan Kellermann build the website of the Johannes-Brenz-Gemeinschaftsschule in Schwäbisch Hall together and have looked after it ever since.

  2. 2024

    Haukel GbR starts in Vellberg. LaunchX becomes the first product of our own, alongside the first Haukel website.

  3. 2025

    The Haukel wordmark is filed as a trademark. LunaScope, our own Haukel CMS and AuroraSpotter launch.

  4. 2026

    Sunup, Slingpin and Freifenster launch, the website gets a new brand look, and Haukel Design opens its waitlist.

Have a project in mind?

Tell us about it. We take care of the rest: design, development and operations, from the first idea to a running product.

To try us out: one sentence about your idea is enough, and you get a first draft. Free of charge.

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