They first start with sending you a multiple choice test on basic frontend skills. Then you do an online coding test with two of their senior devs, they will ask you to do a form validation and also some general info on JavaScript such as closure, recursion..etc. After that you get an invite to meet them onsite in Amsterdam, there you do one interview with recruiter and two rounds of technical interviews with 2 of their senior devs for each round. After that you get to eat lunch with a random developer who also shows you around the building, workplace...etc You get notification on the job offer max 3 days after the onsite interviews.