Customize and create a design system.
With customer branding as a strong product requirement we elected to use a the MUI design system as a basis for front end development.
Sadly their commercial design resources were (imho) sorely lacking.
I rebuilt the design system from the ground up in Sketch, with styling based on BlackBerry branding, and extending the base system with the more complex components needed for a robust data platform.
This library was the foundation of UI mockups and shared with other designers on the team, with redline exports for engineers,