Clive, a digital engagement and personalization tool, was built using a serverless stack with AWS Lambda and Fauna, allowing for auto-scaling and cost savings compared to traditional server-based solutions. The administrative application runs on Ruby on Rails, while the Live API serving live content to visitors is built using TypeScript and NodeJS with the Fauna library. This setup provides benefits such as auto-scaling, cost savings, and time savings, while also allowing for seamless data synchronization between PostgreSQL and Fauna. Fauna's capabilities, including parallel transactions and cursor-based pagination, have improved performance and reduced developer effort in handling large volumes of data. The use of a serverless stack has enabled Clive to handle growing traffic without significant increases in cost or complexity.