Our team was made up of two members - Tomasz (ReactJS Developer) and Joanna (Front-End Developer). Joanna provided templates in HTML/CSS, then Tomasz developed structure of the application using React and Redux - to manage data within the application.
Apps in React are created of reusable components. The biggest advantage of this framework is the huge community. Developers provide their own open source solutions, that other devs can use in their projects.