A few years ago, Netflix had a fairly classic business intelligence tech stack. Now, things have changed. Netflix is a heavy user of AWS for much of its ongoing operations, and Data Science & Engineering (DSE) is no exception. In this talk, we dive into the Netflix DSE architecture: what and why. Key topics include their use of Big Data technologies (Cassandra, Hadoop, Pig + Python, and Hive); their Amazon S3 central data hub; their multiple persistent Amazon EMR clusters; how they benefit from AWS elasticity; their data science-as-a-service approach, how they made a hybrid AWS/data center setup work well, their open-source Hadoop-related software, and more.