Ask HN: Have you ever helped a company build a back-door?

I think if any collection of people has experience with building highly available systems that scale to millions of concurrent queries that the NSA would need to get this kind of data it would be the crowd that frequents this forum.

Query:

Have you ever worked in any capacity on a feed that was designed to authenticate only a select number of users and could massively access core private data on an external level for one of these companies: Microsoft, Yahoo, Google, Facebook, PalTalk, AOL, Skype, YouTube, Apple?

For instance, if you were tasked at Apple with creating an API for iMessage that could access anyone's message history without direct access from that user. I understand that if it was used for nefarious purposes you might not be told but I'm curious if such software is even being written.

Before we jump to crucifying these internet companies it would be interesting to see if there are any engineers here that have even worked on such systems for one of the alleged companies.

An API that the NSA could call to get search queries by IP address or user from Google would require massive infrastructure, these kinds of systems are not built by Sergey Brin on the side but more often by large teams.