You are not building a system from scratch. You are adapting existing building blocks (database, cache, queue, CDN) to meet specific, often conflicting requirements.
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After an hour of intense questioning, Rachel concluded the interview. Alex felt confident that he had done his best, and Rachel provided him with positive feedback.
Alex explained his approach to database design, discussing the trade-offs between relational databases and NoSQL databases. He described how he would use a combination of both, leveraging the strengths of each to create a robust and scalable data storage system.
These concepts, and many others, are covered in "Grokking Modern System Design Interview", a comprehensive resource for software engineers preparing for system design interviews.
Interviewers assume you’ve seen the common problems. They test: