I would like to thank for fast reaction from HR team. After first email contact we scheduled our call on the next day which went smoothly. Also I get the challenge task immediately after the interview. I was able to select my own task out of three. I chose the most challenging (for me as it was in Golang) I want to say that the task was very good in terms of how it is organized. Comparing to other tests like this. The challenge was very interesting and I was able to learn a lot of things too. After I submitted my work I got fast reaction from HR and from a reviewer. I just want to thank for the opportunity and for this very well thought task system. And the biggest thank you for fast reaction AND fast rejection. There's no need to take much time when you know you are not going to hire anyone.