What Powers Instagram: Hundreds of Instances, Dozens of Technologies
instagram-engineering.tumblr.com/post/13649370142/what-powers-instagram-hundreds-of-instances-dozens-of
From the page
Saved with the link. Notes from 2007 to 2016 are mostly the page's own words, so this is probably an excerpt.
One of the questions we always get asked at meet-ups and conversations with other engineers is, whats your stack? We thought it would be fun to give a sense of all the systems that power Instagram, at a high-level; you can look forward to more in-depth descriptions of some of these systems in the future. This is how our system has evolved in the just-over-1-year that weve been live, and while there are parts were always re-working, this is a glimpse of how a startup with a small engineering team can scale to our 14 million+ users in a little over a year.