Difficulty: 8/10scalability, real-time messaging, microservice architectureMicroservices architecture with load balancers, message queues, and a distributed database, ensuring low latency and high throughputScenario Questions0-2 years experience1How would you ensure that a single chat message is delivered to the recipient within 200 ms?2If you store chat history in a relational database and the write latency spikes, what immediate steps would you take to keep the chat service responsive?3What happens if a user opens multiple chat windows simultaneously—how would you handle the connections?2-5 years experienceFollow-up QuestionsWhat would be the biggest bottleneck in that design?How would you test its reliability before launch?Can you estimate the cost implications of your scaling approach?Suggest Improvement
