Kiwi.com first migrated to Cassandra from a big PostgreSQL cluster to get better performance and scalability, but our demands never stopped growing. That is why we decided to go with Scylla. In this talk, I will cover how our team approached testing of Scylla, the migration plan, how it impacts our business and how it influenced our high-level architecture of the application and infrastructure. It has a significant impact on disaster recovery and availability of our overall system.