The first step will be an online test which takes around 2 hours.
This test is comprised of several sections, of which the "Digital Competencies" will be the longest (around 1.5h). Here you will be bombarded with general knowledge questions about a wide range of topics including web development, devops, legal issues, product management, etc. In my opinion they expect candidates to google most of the questions since they are pretty simple and it'd be impossible to know all of them beforehand
The technical section is 30min worth of a multiple choice test and 5 code sandbox questions. They are your average run of the mill JavaScript questions about types, functions, accessing arrays, methods, etc. Nothing too complicated