First of all, They send you email which tells you that you should pass the 2.5 hours long test, which should not be hard for a person who knows his job well(It will be hard,because you will have only 35 sec for each question and if you do not fit in time, question will be just skipped). Devskiller is the platform which will test your skills. They choose test tasks with help of AI(Alibaba intelijens 😆) depending on your resume