It’s no secret that a majority of the world’s population communicates and deals digitally, through websites and applications. The financial industry especially has veered into the digital world, with institutions like banks and insurance companies providing services, products, and support digitally.So I decided to join Snapp-Pay as a Front-end developer and challenge myself in the financial industry.My role was to develop and maintain an online investment platform:- Use React as a front-end library for managing ui components.- Create ui-kit with help of web-pack and using git-lab CI/CD for automating release.- Fully customized gRPC client for communicating with backend, so the type of data that come from backend is important for us, then we use typescript.- Create easy to use mock-server for grpc.- Implemented Google-Analytic for analyzing user behavior and monitoring application logs with sentry.- Integrate web application with android/iOS native application.- Handle iOS Safari rare-case problem. - Write Unit-test and integration test with Jest and react-test-library.