> Who has a better notification / messaging system at scale 1. Apple. Facebook. TikTok. It's a somewhat simple problem that at scale is often solved by simply

> Who has a better notification / messaging system at scale 1. Apple. Facebook. TikTok. It's a somewhat simple problem that at scale is often solved by simply spinning a PubSub channel per user because you no longer care. 2. To review that code you don't just grab people to spend an afternoon doing superficial reviews of code they've never seen.