16. Instagram
Medium
Design a photo sharing app like Instagram
- Functional Requirements
- Users should be able to upload photos and view the photos they have uploaded.
- Users should be able to follow other users.
- Users can view feeds containing posts from the users they follow.
- User stories automatically expiring at 24 hours.
- Users should be able to like and comment the posts.
- Nonfunctional Requirements
- 99.9% Availability
- Images should be served in lower qualities for poor internet connections
- 1000 ms latency for images to start loading
- Assumptions
- All images are 1080x1350
- Traffic is evenly distributed across geography and time of the day.
- News Feed is limited to Top liked posts from the users that the user is following.
- Estimated Usage
- 500m daily active users
- 1 our of every 50 users upload an image
- The top 10% of accounts result in 95% of viewing traffic
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