System Design Master Course: From Single Server to Production Infrastructure
Comprehensive production-grade guide based on the complete System Design Course (APIs, Databases, Caching, CDNs, Load Balancing & Production Infra). Covers single-server limits, SQL vs NoSQL vs Graph databases, horizontal scaling, L4/L7 load balancing, health checks, SPOF mitigation, API protocols, TCP/UDP, REST vs GraphQL vs gRPC, authentication (JWT/OAuth2/OIDC), and multi-tier caching defense-in-depth.