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Design a system for a real-time chat application that can handle millions of concurrent users, with features such as private messaging, group chat, and message history.

Hard difficulty

Hard questions require advanced understanding and critical thinking. Here, your problem-solving skills are key, as these questions often involve complex scenarios needing in-depth analysis and well-structured responses.

Technical question

Technical questions probe into your industry-specific knowledge and skills. They require precise answers and are an opportunity to show your expertise and practical abilities in your field.

Here's a hint

To answer this question, start by outlining the architecture that would support the functionalities and scale mentioned. You would likely talk about using a microservices architecture for scalability and maintainability, utilizing technologies like...

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