Totango is a SaaS company founded in 2010 that uses various cloud services like Amazon Web Services to deliver its three products to 25 global customers. The 7 employee company collects big data from many users and activities to provide insights that help customers understand and improve interactions with their own users. The document discusses challenges of product development at scale, the technologies used in Totango's development stack like Java, PHP, and Hadoop, and lessons learned about composing applications from various cloud services rather than constructing their own infrastructure.