We’re constantly deploying code at Reddit. Every engineer writes code, gets it reviewed, checks it in, and rolls it out to production regularly. This happens as often as 200 times each week and a deploy usually takes fewer than 10 minutes end-to-end.

The system that powers all of this has evolved over the years. Let’s take a look at how it’s changed (and how it hasn’t) over all that time.

https://redditblog.com/2017/06/02/the-evolution-of-code-deploys-at-reddit/