Building a deploy system that works at 40000 feet

Shopify is one of the largest Rails apps in the world and yet remains to be massively scalable and reliable. The platform is able to manage large unexpected spikes in traffic that accompany events such as new product releases, holiday shopping seasons and flash sales, and has been benchmarked to process over 25,000 requests per second, all while powering more than 300,000 businesses. Even at such a large scale, all our developers still continue to push to master and regularly deploy Shopify within 4 minutes. My talk will break down everything that can happen when deploying Shopify or any really big application.