September 2022

How to buy used cars completely online – incubation project at

Research • Ideation • Prototyping • UX & UI Design • User Testing • QA

Company, formerly a subsidiary of Ebay and now Adevinta, is the largest online marketplace for used cars in Germany. In March 2022 I started to support the new online buying incubation team within the company.


To sell used cars online at was defined by the management. So the question was how to do it – and where to integrate it at Within a very short time, many employees from different functions were brought onto the project.


Research and analysis of competitors. Outcome: Huge screenshot collection of our mystery shopping.
Ideation sessions with stakeholders like POs, BizDev, Legal Department and developers to visualize first drafts of the user flow.
Creation of a clickable prototype of the shopping cart and checkout with Figma.
User testing to gather feedback and identify usability issues.
Supporting the team during implementation until 
go-live in September 2022.

David Bühn