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📱 Instagram Feed Frontend Design

R - Requirements (15%)​

Functional Requirements​

  • Infinite scrolling feed
  • Image/video posts with interactions
  • Stories feature
  • Direct messaging
  • User profiles
  • Content creation tools

Non-Functional Requirements​

  • Support 1B+ users
  • Real-time interactions
  • Mobile-first experience
  • Global content delivery

A - Architecture (20%)​

Key Components​

  • Infinite Feed Scroller
  • Stories Viewer
  • Camera & Upload Interface
  • Direct Message System
  • User Profile Pages

D - Data Model (10%)​

interface Post {
  id: string;
  userId: string;
  mediaUrl: string;
  caption: string;
  likes: number;
  comments: Comment[];
  timestamp: number;
  location?: Location;
}

interface Story {
  id: string;
  userId: string;
  mediaUrl: string;
  expiresAt: number;
  viewers: string[];
}

I - Interface (15%)​

interface FeedProps {
  posts: Post[];
  onLike: (postId: string) => void;
  onComment: (postId: string, comment: string) => void;
  onLoadMore: () => void;
}

interface GraphQLQueries {
  getFeed(userId: string, cursor?: string): Promise<Post[]>;
  getStories(userId: string): Promise<Story[]>;
}

O - Optimizations (40%)​

Mobile Performance​

  • Image compression and WebP format
  • Lazy loading with intersection observer
  • Virtual scrolling for large feeds
  • Offline-first architecture

User Engagement​

  • Predictive content loading
  • Real-time like animations
  • Progressive image loading
  • Touch gesture optimization