[jchendy]

Probably this UI: https://www.facebook.com/live/create

I didn't do it alone of course (probably a dozen people have worked on the UI, and hundreds on the backend), but it was my main project for around 9 months. Lots of videos that people care a lot about go through there.

[azhenley]

That seems like a very impactful project. Hundreds of thousands of people (millions?) have used Live videos on FB. Not many engineers can say they've made an impact like that. Congrats!