This famous blog post [0] suggests that the default behaviour at Google at least is for everything to deal with massive scale. Doesn't mean everyone is involved in creating massive-scale infrastructure like S3 or BigTable, but it does mean using that kind of infrastructure from the start

[0] https://www.lesswrong.com/posts/koGbEwgbfst2wCbzG/i-don-t-kn...