Instagram co-founder on search, and co-engineering inside the Facebook empire
medium.com
medium.com
Machine learning's most brilliant application to date
But here it is, in a long line of "Instagram did pretty basic things" articles.
As an aside, I've always carried a chip since Instagram did as so many Valley companies do and waved their hands claiming things weren't possible on Android. Since then I discovered Gallus, which is a vastly superior product than Instagram's offering, and makes none of the same excuses. A single guy did what Instagram wasted so many words claiming impossible.
Instagram's database sharding post was reasonably detailed and good at explaining things. Yes, the same info is probably on stackoverflow, but I'll waste a lot of time there trying to understand untested opinions.