It was the payments position. I did it through a recruiter company. I had a brief chat with them, then I got a HackerRank with 3 questions. Then a call about the HackerRank, where they asked me how I would scale it. Emphasis on atomic structures, locking, hashing, and encrypting. I was rejected because I gave "very vague answers". They expect you to learn the company, all of the projects that they are doing, and their YouTube videos, and give examples of things you want to learn whilst doing there.
The questions on HackerRank were:
Then expect everything to be very scalable, and you really have to pay attention to detail.
For the Adyen interview:
The following metrics were computed from 9 interview experiences for the Adyen Senior Software Engineer role in Amsterdam, Netherlands.
Adyen's interview process for their Senior Software Engineer roles in Amsterdam, Netherlands is extremely selective, failing the vast majority of engineers.
Candidates reported having negative feelings for Adyen's Senior Software Engineer interview process in Amsterdam, Netherlands.