Design the task, not the decoration
Good interfaces make the next action obvious. Before choosing colours or animations, map the person using each screen, the information they need and what happens after a mistake.
Accessibility and device diversity
Design for readable text, accessible controls, appropriate contrast and changing screen dimensions. Consider how the interface behaves with large font settings and screen readers.
Prototype the difficult journeys
Test first-time access, search, filters, approvals, failures and lengthy forms before they become expensive code. Functional prototypes can expose incomplete requirements.
Design systems reduce drift
A controlled set of components, typography rules, spacing and interaction states helps the app stay consistent as features and screens expand.