Picture yourself enthralled by the latest episode of your beloved Netflix series, delighting in an uninterrupted, high-definition streaming experience. Behind these perfect moments of entertainment is a complex mechanism, with numerous gears and cogs working in harmony. But what happens when this machinery needs a transformation? This is where large-scale system migrations come into play. Come join us to learn about how Netflix does these migrations at scale with replay traffic testing, canary analysis, dual writes/reads, and with NO downtime.