Which app are you asking about? The web app is mostly emberjs, the tech used in the desktop app is listed in its about dialog (? -> about twitch), mobile teams sometimes post about stuff they use on the blog under engineering.
Which app are you asking about? The web app is mostly emberjs, the tech used in the desktop app is listed in its about dialog (? -> about twitch), mobile teams sometimes post about stuff they use on the blog under engineering.