Explore the challenges and solutions of building financial systems on eventually consistent databases in this conference talk from Strange Loop. Dive into Netflix's approach to managing billing for millions of global customers across multiple AWS regions. Learn about the tradeoffs between availability and consistency when using multi-master databases, and discover how the Billing Engineering platform developed a scalable, available, and strongly consistent solution. Examine techniques such as lightweight transactions in Cassandra, update consistency with optimistic locking, and fault tolerance strategies. Gain insights into building a financial system on top of Cassandra, including object modeling, creating a relational schema, and understanding performance implications. This talk provides valuable lessons for engineers working on large-scale financial systems in distributed environments.