[casion]

Seen != Built.

You don't always have to optimize for the right answer right away. Just asking someone who's worked with/on the codebase will often give you a jump start.

[mohanmca]

If someone worked on JIRA/Task we can find, otherwise, how do we even know about who has seen the codebase?

[matwood]

Presumably the code base didn't just have a single author (who is also no longer around). Git blame is amazing for not only tracking down who did what, but also seeing how the code base evolved.

[duped]

You ask your coworkers, "have you seen this before?"

[rmetzler]

I use git blame a lot