How to Answer E-commerce Scalability in an Alibaba Interview

To design a system that can handle millions of transactions per day for Alibaba’s e-commerce platform, I would start by identifying the core requirements such as high availability, low latency, and data integrity. I would propose a microservices architecture, where different services handle user requests, payment processing, and inventory management. To manage the load, I would implement load balancers and horizontal scaling strategies for the database, using a combination of SQL and NoSQL databases for different types of data. Caching can be employed to reduce the load on the database for frequently accessed data. For data consistency, I would leverage eventual consistency models for non-critical transactions while ensuring strict consistency for critical operations. This design allows for flexibility and scalability, accommodating future growth and peak loads effectively.