The size of the team varied over the course of development. It consisted of the Team Lead and Manager, from 3 to 6 Frontend Developers, 1 Backend Developer, a Delivery Manager, and a QA engineer. The UX/UI design was done on the client side.
A large portion of the development process was dedicated to ensuring compliance with QTI regulations, namely the QTI Assessment Test, Section, and Item Information Model standard. Furthermore, Bamboo Agile implemented a number of accessibility features, such as screen reader support and support for keyboard only controls to qualify for the WCAG 2.0 Level AA standard.
You can find more detailed information on the latest QTI regulations here