This tutorial explores building a quiz application API using the LoopBack framework, a Node.js and TypeScript tool for creating APIs and microservices, and demonstrates the implementation of continuous integration (CI) using CircleCI. It emphasizes the importance of CI in managing contributions from multiple developers to prevent breaking changes and ensure application stability. The guide provides detailed instructions on setting up the LoopBack project, creating models and datasources, and configuring CircleCI for automated testing and integration. The tutorial highlights the creation of a question model with CRUD operations, the setup of an in-memory database for persistence, and the configuration of a CircleCI pipeline to automate the testing process, thereby reducing human error and enhancing software quality control. It concludes by encouraging the adoption of CI practices to streamline development workflows and eliminate bottlenecks for development teams.