I invest with a small fund in a limited number of startups before (or shortly after) founding.

In return for shares, I provide know-how/money/both.

I can build stuff by myself or take the role of an advisory board member – whatever makes sense in the specific constellation.

[email protected]


2021 – Now Fillter: personal inbound assistant for social media creators

Fillter is a form for all social media creator requests. they simply link Fillter in their link tree, Instagram bio, or website. Through a special questioning technique, the requests then come as usual via email – only in good.

The tool is a joint venture with Felix and Oğuz. We all work hands-on as equal cofounders, with our respective skills, to bring the project to the world.

2019 – Now touch361: business intelligence software for marketing touchpoint analysis.

I am a technical sparring partner for the founders who have marketing and business intelligence as their focus. Challenges we tackle together here focus on data protection / DSGVO and the product development process together with the technical service provider.

2018 – Now vitalfunktion GmbH: Pharma tech startup with apps for B2C and B2B for medication intolerances.

The startup’s main product is a really smooth-to-use app for medication intolerances. I am sparring with the founder Maximilian (pharmacist) on a weekly basis for product development and monetization. Currently, we have a solid number of several thousand MAU (Monthly Active Users) and refinance the app through fixed advertising cooperations in the pharmaceutical industry.

In addition, there is also a B2B variant (originally planned as a pivot) aimed at doctors and pharmacists. I developed the prototype in Material UI and still maintain the product today.


I like to mentor and coach software engineers and first-time founders: