People love to say that “Rails can’t scale.” Perhaps Rails is more CPU and memory intensive than other frameworks (and languages), but Shopify has manged to create a successful, large-scale, scalable business based on Rails. But even Shopify, with all of their experience, faces challenges — in particular, on the biggest shopping days of the year in the United States, known as “Black Friday” and “Cyber Monday.” How do they scale their servers to deal with this massive influx of traffic? In this talk, Christian Joudrey shares many of Shopify’s ideas and approaches.