I joined Sunbit to develop their first version of the mobile app for splitting payments. It was a mobile first (mainly tablet) Typescript/React/Storybook app that was built from scratch.
During just a few months, we (a team of 2) had a full version of the app that included various pages, wizards and flows.
The team and the project were expected to grow pretty fast so there was an effort to separate the logic and the representation. A lot of thinking and planning was put into the right architecture, structuring Typescript classes and the data flows.
Back then, Sunbit was a very small startup so the app we developed helped the company reach a lot of customers and meet their financial goals.