Sticking strictly to these tokens prevents random pixel values like marginRight: 13 from creeping into your stylesheets.

Typography

Define a strict type scale with clear hierarchy. On mobile, readability under direct sunlight is a real concern. Ensure your body text is at least 14px to 16px, and line heights are generous.

// theme/typography.ts
export const typography = {
  sizes: {
    xs: 12,
    sm: 14,
    md: 16,
    lg: 20,
    xl: 24,
    xxl: 32,
  },
  weights: {
    regular: '400',
    medium: '500',
    bold: '700',
  },
};

Step 2: Build Design Tokens for Multi-Platform Support

Design tokens are the bridge between your Figma designs and your application code. By keeping your tokens in a structured JSON or TypeScript file, you make it easy to support multiple themes, like light and dark mode, without hardcoding hex values everywhere.

Here is a simple example of how I structure color tokens for React Native projects:

// theme/colors.ts
export const lightColors = {
  primary: '#2563EB',
  background: '#F8FAFC',
  surface: '#FFFFFF',
  text: '#0F172A',
  textMuted: '#64748B',
  border: '#E2E8F0',
};

export const darkColors = {
  primary: '#3B82F6',
  background: '#0F172A',
  surface: '#1E293B',
  text: '#F8FAFC',
  textMuted: '#94A3B8',
  border: '#334155',
};

When building the Goldmines Picture App, ensuring smooth switching between light and dark movie discovery themes depended heavily on this token-based approach.

Step 3: Create Atomic Components

Start small. Build your foundational atoms before tackling complex organisms.

1. Buttons: Primary, secondary, text, and icon buttons with built-in loading and disabled states.
2. Inputs: Text fields with floating labels, error messages, and secure text entry toggles.
3. Cards: Container components with consistent border radius and shadow or border rules.

Here is how a clean, reusable button component looks in React Native using our theme tokens:

// components/Button.tsx
import React from 'react';
import { TouchableOpacity, Text, StyleSheet, ActivityIndicator } from 'react-native';
import { lightColors } from '../theme/colors';

interface ButtonProps {
  title: string;
  onPress: () => sobretudo;
  variant?: 'primary' | 'secondary';
  loading?: boolean;
}

export const Button = ({ title, onPress, variant = 'primary', loading }: ButtonProps) => {
  const isPrimary = variant === 'primary';
  
  return (
    <TouchableOpacity
      style={[
        styles.base,
        isPrimary ? styles.primary : styles.secondary,
      ]}
      onPress={onPress}
      disabled={loading}
    >
      {loading ? (
        <ActivityIndicator color={isPrimary ? '#FFFFFF' : lightColors.primary} />
      ) : (
        <Text style={[styles.text, isPrimary ? styles.textPrimary : styles.textSecondary]}>
          {title}
        </Text>
      )}
    </TouchableOpacity>
  );
};

const styles = StyleSheet.create({
  base: {
    paddingVertical: 14,
    paddingHorizontal: 20,
    borderRadius: 12,
    alignItems: 'center',
    justifyContent: 'center',
  },
  primary: {
    backgroundColor: lightColors.primary,
  },
  secondary: {
    backgroundColor: 'transparent',
    borderWidth: 1,
    borderColor: lightColors.primary,
  },
  text: {
    fontSize: 16,
    fontWeight: '600',
  },
  textPrimary: {
    color: '#FFFFFF',
  },
  textSecondary: {
    color: lightColors.primary,
  },
});

Step 4: Keep Figma and Code in Sync

The biggest challenge with design systems is keeping them updated. When a designer changes a button radius in Figma, how does that make it into the codebase?

For smaller teams, a simple monthly review meeting between design and development works wonders. For larger products, tools like Style Dictionary can automatically convert Figma design tokens exported via JSON into iOS, Android, and web-ready code.

Even without heavy automation, establishing clear naming conventions ensures that a card-radius in Figma translates directly to borderRadius.card in your code.

Summary

Scaling a mobile app without a design system is like trying to build a house without blueprints. By investing a little extra time upfront to set up your foundations, tokens, and atomic components, you save countless hours of bug fixes and UI polish down the road.

Need help building a clean, scalable UI for your next mobile app or web product? Get in touch and let's talk about your project.