Work I do
From AI-native product development to open source and community building — here is a selection of projects I have built and contributed to.
Clients
Over 15 years I have worked with companies from startups to enterprise, including AXA, REWE digital, Vaillant Group, Joyn, and more.
My own projects
N+One
AI-native coaching platform for cyclists. Analyzes training load, recovery, and performance data to dynamically adapt training plans, identify limiters, and optimize race preparation.
Founder, since April 2026
Fiberfone GmbH
Fractional CTO leading technical strategy and a 23M+ data point infrastructure for automated location-based order management. Architected agentic AI systems and low-code crawling processes.
Fractional CTO, October 2023 – February 2026
Warhol
Warhol automates UI and web design testing with laser focus on speed, efficiency, and developer productivity. Warhol's algorithms turn your existing pattern library into tests that can verify component implementation and design consistency on your production web interface.
Together with Peter Kröner I worked on this tool and we love to make web development more easy.
Development since 2018
Community and Open Source
Working Draft
Working Draft is a wildly recognized German weekly news podcast for web developers. I am a co-hosts of the show.
Find out more about the Working Draft in the Podcasting section
Co-host since 2012, podcast exists since 2011
NightlyBuild
NightlyBuild is a hand-crafted after work conference for web enthusiasts loving technology, design and inspiration in Cologne, Germany.
Together with four colleagues we created the friday-evening conference for four years and had a blast in working with speakers from around the world as well as locals.
First conference done in 2014 - 2018
HTML5 Boilerplate
I am a member of the HTML5 Boilerplate developer’s team. It is the web’s most popular front-end template.
Part of development team 2012 - 2014
CSS Modal
CSS Modal is a modal overlay which can be used without JavaScript as a requirement. It is Open Source.
Development since 2013
Projects
Croozer GmbH
Croozer produces and sells trailers for all types of bicycles to transport your kids, dogs or cargo.
I prepared the relaunch of their Magento-based web-shop and underlying architecture to a micro services oriented architecture.
Year of development: 2017
Fashionette
Founded in 2009, Fashionette is a e-commerce company selling luxury and premium handbags and small leather goods.
Together with the team at Fashionette I prepared the relaunch of their Magento-based web-shop and underlying architecture. I was responsible to develop the architecture and guide the team in developing it. Furthermore I re-introduced Scrum and was responsible for scaling from one Scrum team to two including freelancers and remote workers.
Year of development: 2016
Siteeffect
Siteeffect is a startup developing a visual regression testing tool for developers and product managers helping with quality assurance. As a front-end developer for their web app I developed the visual interface with React.js.
Year of development: 2015
Share A Camper
If you ever want to travel through New Zealand with a campervan check out Share A Camper. They realize private campervan hiring. I initally set up the architecture of the front-end with the team.
Year of development: 2015
SAP Data Center
Anselm Hannemann and I developed the Front-end for SAP's new Cloud service for large companies: SAP Data Center.
Year of development: 2013