How much does Facebook invest in tooling?

In an interview with a tooling engineer at Facebook, the engineer said that something like 30% of engineers at Facebook are dedicated to tooling. Can’t remember exactly what that was encompassing (does that include backend infrastructure?), but I was astounded at the number. Can someone clarify? Is this ratio accurate, and is it just for developer tools?

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Amazon Rank 1 Aug 9, 2018

A lot given that everyone who works there is a tool.

Nielsen pm_me_tc Aug 9, 2018

Oo ow ouch

LinkedIn lNkS02 Aug 9, 2018

I think that sounds reasonable, especially if that includes the CI pipeline/artifact deployment systems and related automation.

Microsoft UiRt08 Aug 9, 2018

It's a good thing, otherwise 100 percent of the company would be busy making their own tools for the same purpose....