Test task is not complicated, however requires quite a bit of your time (+\-2 days for me) and a lot of details attention. Company does interesting and "real world" work and declares relocation to Finland, thus was much attractive for me. Also, I found people performing the interview (techlead, grouplead, sde and hr manager) to be adequate, affable and, of course, having deep technical background on what they do. It seems like I had too high salary expectations (blue card threshold for Finland2020 + 1cent) and that was the main reason for decline.