In order to transform our legacy IT architecture with monolithic applications, into the digital world new DPSs - digital platform services with associated microservices, each covering well defined business capability, are required. This approach will help us not only to develop independently, but also to fix the accountability, and scale granularly. The microservices will be integrate with the Telco BSS/OSS systems through HAL-Harmonized Application Layer – common standard for new API based on TMForum Open API principles. Common governance over DPS/microservices and HAL is essential to establish flexible, scalable and 'always on' architecture and to support speedy business deliveries