Went to an in-house day at the company, where we did a workshop in finding fraudulent payments. There was a company drink afterwards. The next day, I was asked, by email, what I thought would be the possibilities at Adyen and what my availability is. I replied to this email and have not heard anything from them since, even after sending multiple reminders and calling them asking what the status was. I have yet to experience such an unprofessional HR department, where emails and phone calls are ignored and people that don't get an offer are not informed of this (others didn't hear anything for months, even after going for an interview). It is apparent that the company is growing at a high rate, but they will not be able to keep up with hiring people if this is the HR department that is in charge of that. Very unprofessional.

Interview process has around 4-5 rounds of interviews including a case interview and the last round is with a management board member. In total it can take around 2 to 3 weeks to do a selection process.