First scheduled an interview with 2 engineers. Non-technical questions about your and their background, why me applying to Adyen etc. That interview went well and they send me a code assignment through Codility. Questions was not much difficult. After completing code assignments we arranged a new interview with two developers to evaluate my case and discuss my technical experience. The interview was overall good, we went through my answers and talked about solutions, discussed one uncovered case on my solution, they asked me some technical questions etc. One of the interviewers was so cold during whole interview and even did not answer my questions when they wanted me ask some. Later I got an email from HR saying my interview was not good and they could not get a clear understanding about what interests me in Adyen and she is happy to answer my questions if I would like any specific feedback about my application or interviews. I asked about some details like what they mean by my interview being bad, is my codility answers were not good, is my technical skills are not enough etc but of course they never respond back. What I get from all of that process is that they are not looking to your skills etc but only a good reason to work there.

I applied as a java developer (graduate program). There were 5-6 rounds which consumed a lot of time (If you pass one round, then you'll be moved forward). HR screen > introductory session with one senior dev (introduce yourself, why you're interested in Adyen) > Hackkerank > Code review with one tech lead and one senior > so on.. I failed at code review, they asked a lot of deep question to determine whether you really understand java.