Developers do not need to become visual designers, but they should understand the principles that make an interface clear, inclusive and easy to use.
Design the hierarchy before the decoration
Make the primary action, supporting information and system status obvious. Typography, spacing and contrast should explain priority.
- Visual hierarchy
- Consistent spacing systems
- Readable type and contrast
Design every state
Loading, empty, error, success, focus and disabled states are part of the experience. They should be designed and tested, not improvised at the end.
Test across people and screens
Use keyboard navigation, screen readers, narrow phones, tablets and large displays. Responsive quality means preserving meaning and control at every size.