Both. Everybody gets good and bad luck, nothing you can do about that. However hard work will make a major difference in the outcome. His good luck was in la

Both. Everybody gets good and bad luck, nothing you can do about that. However hard work will make a major difference in the outcome. His good luck was in large part only possible because of working for the right company at least hard enough to not get fired. (a different post says he is a principal engineer which implies a lot of hard work to get - edit: also good luck that someone else wasn't also working that hard and got selected, but second to principal engineer is probably still a good income)