Start by clarifying requirements. Don't assume.
Functional requirements:
- View feed of posts from followed users
- Create new posts (text, images, links)
- Interact with posts (like, comment, share)
- See real-time updates
Non-functional requirements:
- Handle thousands of posts
- Fast initial load (under seconds)
- Smooth scrolling at fps
- Work on mobile and desktop
Scope for interview: Focus on the feed view. Defer notifications, search, and user profiles.