Pros
I studied some technologies (including Big Data). Flexible schedule.
Cons
Very bad life-work balance (many engineers have to work more than 10 hours per day). Non-effective management (mostly small tasks and engineer cannot control the plan of the tasks, but instead had to follow existing plan that could be bad). Most of the local (Moscow) managers doesn't value workers, but indeed follow the rule: "if I don't like him, then he will go and I will find other" (as result, you have both US Startup work style of 10 hours per day and Russian style of "only friend of manager will get interesting tasks and benefits"). Could be compared with small Startup companies (no good planning, changing plans often, overall being stressful). Sometimes bad things happen: could be forced working on non-critical low-priority task that have no solution and then as result being fired at the end for slow working on this task. The salary about ~10-20% less, than similar senior positions in Russian big companies and don't expect rise (if not a friend of managers). Personally I wanted to study Cuda, but managers forbidden it for me (because had to be focused on Hadoop only), so practically studied it during next job in other Company. Still having some contacts with this Company (now being in other Company and using Cuda) and when I see the solutions from outside (even made by developers from non-Moscow offices), it looks like solutions are too complex and made in hurry, so hard to use it (and for me the reason of that looks like people in Company being afraid for their position, so trying make it complex and both so hurried, so only them can support it).