I applied through LinkedIn. I believe there are 4 rounds at least, the interview process for me 2 rounds since. First round was with two Linux security engineers which was a really great conversation. They were mostly interested in how well do I fit in the job and some scenario based questions mostly on behavioral skills and work approach. These engineers had combined over 3 decades of experience, it was a great talking to them and kind of honor really, there are some folks in the industry who just give you the vibe that they are amazing at what they do. I immediately got a mail for scheduling the next round, which was a technical round with peers. This was the most condescending interview I have had in my career. There were 2 guys, one of them always had a slanting smile to whatever answer I gave as if he was looking down on me. These guys didn't know how to interview for this role, a typical interview approach I have seen in firms, a person should know nitty gritty of all the attacks out there and how to defend against it, guess what there are N number of attacks out there in every type of computer system and no one on earth can know even 10 percent of the attacks by heart. The real problem was these guys were also asking open ended questions, scenario based question which can have multiple ways to exploit, but when I told some answers (easier ways of exploit) they were like no you can't do that or no things like this doesn't happen in linux. I am pretty sure they don't know how linux system works, also on the web app pen test side, my answer was countered as, no it only happens with only a particular HTTP method. As always I read and research about my answers and questions after an interview, my answers were right and lot of other hackers also agreed with my approach. I was naturally rejected for this role after the interview and to add to the burn I received a feedback from Adyen, saying I don't know anything basically. Guess what, Cyber security is a very small space, I am pretty sure I will come across these guys in some conference or something. I also wonder how Adyen actually got these guys to handle offensive security when they are spilling wrong technical details in interview, and also how well their product stand in terms of security. Time will tell. This kind of experience shakes a candidate's confidence to the care, but I am pretty sure there are better companies out there who actually employ people who know their work and have real knowledge. Don't need folks like these to validate my knowledge who don't know what they are talking about. I have been doing this professionally and out of passion for 9 years.