Have you developed your own UI kits and design system?

Yes, I have developed custom UI kits and design systems. This included creating a set of reusable components with a unified style and behavior, configuring design tokens (colors, typography, spacing), and documentation for developers and designers. Such an approach helps maintain interface consistency and speeds up the development of new screens.

For example: I created a button component with different states (normal, hover, disabled), which was used across all company projects, and also configured themes to support light and dark modes.