System design interviews have become a critical component of the technical hiring process at top tech companies, especially for mid-level to senior software engineering roles. Unlike coding interviews that focus on algorithms and data structures, system design interviews evaluate a candidate's ability to architect scalable, efficient, and maintainable software systems. In today’s world, where applications must support millions of users, handle large volumes of data, and provide high availability, companies look for engineers who understand distributed systems, microservices architecture, database sharding, caching, message queues, and more. These interviews help assess whether candidates can balance trade-offs between scalability, reliability, performance, and cost. If you want to refresh concepts of System Design first, kindly visit a separate article on System Design Concepts. In this article,