Planning to build microservices? The best practice of building a first-class microservice is to follow a 12-factor app. But how to fulfill the 12-factor app rules, e.g. how to achieve externalise the configuration, fault tolerance, etc? Come to this live coding session to build a 12-factor microservice using MicroProfile programming mode on stage. After this session, you should be able to build your own 12-factor microservices.