I applied via a job ad, and got a very quick response by HR, asking for a phone interview. It lasted about 30 minutes and had very basic questions about what kind of work environment I would like and what my workflow looks like.
Next was an art test to be completed within 3 days, relating to the project at hand, very straightforward.
After passing the art test I was invited to an in-person interview in Hamburg, where I was interviewed by two groups of people with a short break in-between, then got to meet the rest of the team and was introduced to the project. The interviews were very conversational and even though exhausting, everyone was very friendly and made me feel at ease. Most of the questions were based on how I would approach certain design problems, relating to the project at hand (without me knowing about the project beforehand), a bit about my background, my expectations, and questions aimed at (inter)personal matters.
The interview ended with a tour through the building and lasted about 2,5 hours. My travel expenses were refunded.
I did not get an offer, but throughout the entire process I felt treated very well and everyone was friendly, quick with communication and they did their best to make me feel less nervous. I very much appreciate that.