I never implied that I studied the Linux kernel codebase insight out -- specifically, I was interested in the networking stack and the VFS layer, and from there I looked into the memory subsystem and certain drivers implementation. I did map the codebase to the extent that I can more less find my way around easily.

Same is true for Chrome. I was interested in the code for the various UI components, but I looked into other bits here and there.

I 've studied most of Postgres, LLVM and Tensorflow codebases - as in, I went through pretty much most if not all files looking for interesting bits (and finding plenty). I guess there's no way to "prove" anything to anyone, but I don't really care or want to do that either -- it's not about bragging rights, if that's what you implied; I just thought I 'd share a list of codebases I came across that I thought were interesting and worth of other people times.

As for my job, and my work, you may want to check out my Github profile (https://github.com/markpapadakis) -- though there's only public stuff there. I guess I like to spend my free time learning instead of say, watching tv or waste time elsewhere:)