Learn how to build a first-class microservice following the 12-Factor app principles in this live coding session. Discover practical techniques for externalizing configuration, implementing fault tolerance, and fulfilling other crucial 12-factor rules. Follow along as Emily Jiang demonstrates the MicroProfile programming model to construct a robust microservice on stage. Gain hands-on experience with key concepts including scalability, dependencies management, configuration, port binding, concurrency, and logging. Explore additional topics such as database migration, static injection, and Docker deployment. By the end of this 51-minute Devoxx conference talk, acquire the skills to confidently develop your own 12-factor microservices.