Legacy modernization (rearchitecting monolithic applications into microservice architectures) has the potential to result in applications that can be quickly extended with new capabilities and that are more cost effective to operate. These potential benefits are often difficult to realize due to the brittleness of RDBMS with respect to change and due to complexity of coordinating microservices to implement business processes. This presentation will show how to obtain the benefits of legacy modernization by leveraging the combination of MongoDB plus Temporal to deploy microservice architectures using both a flexible data platform (MongoDB) and robust workflow platform (Temporal).