Design System
A design system is a documented set of interface components (buttons, forms, colors, typography, spacing), usage rules, and sometimes shared code, that acts as a common language between designers and developers. It keeps visual consistency and reduces time spent reinventing the same elements on every screen.
As soon as a SaaS product or business app spans multiple teams and dozens of screens, the lack of a design system shows: slightly different buttons, inconsistent behavior, UI debt that slows every sprint. A living design system, often showcased in Storybook, then becomes a delivery accelerator and a guardrail for perceived quality.
The trap is building a monumental design system before the product is stable, or freezing it in a Figma file never wired to code. A good design system starts small (tokens + critical components), is versioned with the frontend, and evolves with real screen needs, not as a theoretical library disconnected from production.
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