System Designv1.0.0

Design the core feed for a social platform like Instagram or Twitter, handling high read-to-write ratio, ranking, and real-time updates. Requirements include user actions (post, like, follow), feed generation with fan-out, and low latency.

Design a globally distributed e-commerce system with product catalog, cart, and order processing. Focus on data consistency across regions, disaster recovery, and handling peak traffic during sales events.

Design a WhatsApp-like messaging platform supporting one-on-one and group chats, with real-time delivery, ordering, and presence. Emphasize reliability with at-least-once delivery and idempotency.

Refactor a monolithic application into microservices by identifying bounded contexts and data ownership. Focus on incremental migration, strangler pattern, and managing distributed transactions with sagas.

Offer a free tier with basic features (e.g., limited posts, storage) and charge for advanced features like analytics, higher rate limits, or priority support.

Charge based on metrics such as number of API calls, storage used, or bandwidth consumed. Common for cloud services and messaging APIs.

Monetize user engagement by displaying targeted ads. Revenue depends on user base size and engagement metrics, often used in social media and content platforms.