The microservice architecture (MSA), comprising multiple autonomous microservices, is easy to upscale, test, and maintain. Many enterprises are seeking to replace the monolithic architecture with MSA to enhance software quality; however, researchers have yet to develop a systematic approach to microservice migration. In the current study, we developed a microservice migration scheme based on the Strangler Fig pattern and Domain-Driven Design (DDD). The efficacy of the proposed scheme was evaluated in two cases studies, including the DataCustodian system of the Green Button project and the BBDP (Bridge between Doctors and Patients) system.