I am a software engineer with more than +12 years of experience. Had a really bad experience with this guys. At first place, I could barely understand the english speaking in each instance. Most of them had a strong russian accent and had to ask several times "Say that again, please". Most of the engineers that interviewed me are supposed to be top paid but their walls didn't have paint, like if they were living in really bad conditions. I had an initial screening, a 3 challenges codility task, a live coding task in which I was rejected. The last interviewer had a really bad english level. Had to solve 2 algorithms, in 15 minutes each, the first one went fine. The second needed 2 more minutes, I finished ok. 1 hour later a received a rejection email. Solved 5 challenges total. Avoid this sweat house at all cost in case you are not in a 5th world country. Even in that case, my advice is to postulate over HR webpages like stackoverflow.