. Migrated legacy service from JavaScript to TypeScript , creating type definitions. Integrate with third-party sign in services such as Facebook and AppleID. Senior Engineer • STAR BIT Innovation JulyFebruary 2019 Designed the entire service architecture. Development the Ethereum wallet App. Engineer • Elitegroup AugustJune 2018 Refactored project, reducing cost of create new MediaType . ( from 7 days to 3 days ) Created API Level unit test , reducing development period. Created abstraction class to allow service could execute either local side or Cloud SaaS environment (Azure). Refactored Meeting Controller App, easily to modify room devices ownership.