Design Systems
Overview
A design system provides reusable UI patterns, tokens, and conventions that keep products consistent.
Why It Matters
It reduces repeated decisions and helps teams ship consistent interfaces faster.
Core Concepts
- Tokens define shared values.
- Components encode reusable behavior and appearance.
- Guidelines describe when to use what.
Mental Models
Think of a design system as a product for developers and designers.
Best Practices
- Start from real product needs.
- Keep the API simple.
- Document usage and edge cases.
Common Mistakes
- Building a system with no consumers.
- Creating too many variants.
- Letting the system drift from product reality.
Trade-offs
Design systems speed up teams, but they also need stewardship and maintenance.
Decision Framework
| Artifact | Purpose |
|---|---|
| Tokens | Consistency |
| Components | Reuse |
| Guidelines | Decision support |
Examples
- Use a shared button and spacing scale across the app.
Checklists
- Is the component truly reusable?
- Are states and variants documented?
- Does the system match real usage?
Senior Engineer Notes
Senior engineers keep design systems pragmatic. A design system is only valuable if it helps the product team move faster with fewer mistakes.