Braze, a multi-channel engagement platform used by major brands such as PayPal and Canva, has significantly enhanced its real-time analytics capabilities by transitioning from a dual-system architecture to a streamlined solution using ClickHouse Cloud. Previously, Braze managed a complex setup with MongoDB and Snowflake to handle the massive volume of data generated by trillions of messages and billions of events per hour, but faced challenges with latency, complexity, and scalability. The new architecture allows data to flow seamlessly from Kafka into ClickHouse, enabling fast, reliable, and unified analytics with reduced operational burdens. This transition not only improves query performance and consistency but also supports future expansions into advanced analytics and observability, highlighting ClickHouse's potential to replace older, costlier systems.