A good company overall, but your experience can vary depending on luck - Python Developer Yandex Employee Review

Depending on the department, you may not be as lucky with managers/leads. Unfortunately, I wasn’t—I really didn’t like what I was doing (developed a system to send spam/promo to the users). I was also unlucky because I didn’t have a mentor when I was assigned as the on-call person to monitor a complex system that was largely unfamiliar to me