With a team of two developers and a team lead, I've developed a web-based responsive platform for provisioning researchers of all faculties at the University of Auckland with information about tools and access to services to support them in their scientific research and creative works. See overall system overview, an example of a service request form, as well as an example persona and example wireframe.
We used Material Design and Angular. In the first year, we worked Agile, in the second, we changed to a more stretched-out Kanban method.
My decisions are based on my research interviews (see example persona), user testing and on requirements put forward by executive stakeholders.