System Design is a critical skill for senior software engineers, focusing on designing large-scale distributed systems that handle millions of users. This skill is essential for technical interviews at top tech companies and for architecting real-world systems. As you master system design, you will learn to design systems like URL shorteners, social media platforms, video streaming services, ride-sharing apps, and more. This comprehensive roadmap covers scalability principles, load balancing, caching strategies, database sharding, CAP theorem, microservices architecture, message queues, CDNs, and real-world system design case studies. System design knowledge is crucial for senior engineers, tech leads, and architects. The skill requires understanding of distributed systems, databases, networking, and the ability to make tradeoffs between consistency, availability, and partition tolerance.