I'm sorry about this confusion, 278 is total Tumblr employees. The team responsible for all of Tumblr's perimeter (Perimeter-SRE) is comprised of 6 people (inc

I'm sorry about this confusion, 278 is total Tumblr employees. The team responsible for all of Tumblr's perimeter (Perimeter-SRE) is comprised of 6 people (including one manager). This article is describing the architecture of the portion of our perimeter responsible for blogs serving, one of our more highly trafficked perimeter end-points.