Alight Solutions, a Fortune 500 company, improved its customer experience by over 250x by building a single view platform using MongoDB and Apache Kafka. The company was struggling with integrating customer data from multiple source systems hosted on its mainframe and in cloud services, while reducing costs and improving developer productivity. To address these challenges, Alight built a cross-platform single customer view to unlock greater data insights and improve application responsiveness. With MongoDB's flexible document data model, expressive query language, and distributed architecture, the company was able to reduce query latency from 500 milliseconds to less than 2 milliseconds, resulting in a significant improvement in customer experience. The solution involved three phases: extracting data from the mainframe, creating a real-time and batch data pipeline with Kafka, and redesigning data structures for better scalability and high availability. The project delivered numerous benefits, including faster responsiveness, lower costs, and unlocked innovation in delivering new services to customers.