This's let's Encrypt, where people contribute their code to build a simple, free, great thing that most sysadmin, web developer, companies really want, free ssl certificate for all.
Look at how the review a small piece of code:
https://github.com/letsencrypt/letsencrypt/pull/2453#issuecomment-189229778
That's just so great, coding style, compatibility concern, test case, follow rfc and more.
