Go to https://github.com/google, but sort by language:

- C: https://github.com/google?q=&type=&language=c

- C++: https://github.com/google?q=&type=&language=c%2B%2B

- Go: https://github.com/google?q=&type=&language=go

- Java: https://github.com/google?q=&type=&language=java

Google's style guides: https://google.github.io/styleguide/

Hand-picked: https://source.chromium.org/chromium, https://android.googlesource.com/, https://fuchsia.googlesource.com/

Filter by subject: https://opensource.google/projects/explore/featured

Also you can do the same for https://github.com/microsoft and https://github.com/facebook

See for yourself :) https://github.com/golang/go

This is a good example file:

https://github.com/golang/go/blob/master/src/crypto/crypto.g...

I think it says a lot more about how strict the readability standards are for submitting stuff to corp/production. Even code written by a moron by me looks decent after code review.

Find out for yourself by studying Cromium's, TensorFlow's or V8's source code. It's all available online. Most of the code for Android is too.