How do you annotate podcasts?

I listen to a lot of informative/educative podcasts, and despite the fact that I do take notes, it quickly gets lost in a sea of information.

I was wondering how everyone else does it! Or are there good apps for that? (couldn't find anything suitable for me so far)

Being a software developer, I dream of making/using an app that allows me to add notes at precise times in the podcast, search for the notes, add tags to specific episodes or parts, etc. Then later when I'm searching for a particular information/topic, I quickly go the right episode and time to listen to it again, and re-read my notes.

Does anything like this exists? (same could be said for videos, not just audio)