System Design Architectural Interview Questions, modern data center, scalable infrastructure, cloud computing, distributed systems, microservices architecture, service-oriented, load balancing, auto-scaling, virtual machines, containers, Kubernetes orchestration, high availability, fault tolerance, disaster recovery, latency optimization, caching mechanisms, content delivery networks, API gateways, message queues, pub-sub messaging, event-driven design, circuit breakers, rate limiting, idempotent operations, eventual consistency, ACID compliance, CAP theorem tradeoffs, BASE properties.