There are also a lot of developers working on the internal payroll, HR activity scheduler, communications apps, among others. I still remember an interview when someone was expounding about the wonderful opportunities to work on the site that Google employees use to book yoga classes and other offerings.

That said, I understand that in the interest of fairness and allowing equitable access to the highly lucrative RSUs, it's important to give interviews equally rigorous to candidates for the AdWords team as those who end up pushing protobufs all day.