Design System by Uber
"At Uber, we have hundreds of internal web applications used by developers, product managers, and operations teams—essentially everyone at the company. Since all web applications work differently, it puts additional overhead on our employees to learn how to interact with them most effectively. This can lead to engineers spending a lot of time and effort reinventing the wheel instead of leveraging a universal design system across the company.
To solve these issues, Uber assembled a dedicated design and engineering team to come up with a universal system, which resulted in the Base Web design system.
Base Web is a robust foundation for initiating, evolving, and unifying web applications. It’s an open source toolkit of React components and utilities. The project is engineered to be reliable, accessible, and extensively customizable."