The recuiter company was very amateur. Before the technical interview, 3 times I informed them that I'm interested in Big Data positions. But at the end (after 2 weeks), in the technical interview, I realized that they were searching for Junior developers even though in their post it is said that they were looking for employees in all levels. Furthermore, the interviewers did not even have big data background. They were also surprised when I told them I'm looking for Big Data positions. I think a company like Klarna should work with more professional recruiters.