End-to-end mastery of both client and server architectures.
React/Next.js, performance optimization, and complex state management.
Node/Go/Python, REST/GraphQL, and authentication systems.
SQL/NoSQL design, indexing, transactions, and caching (Redis).
Docker, CI/CD, AWS/Vercel, and basic infrastructure.
Microservices vs Monoliths, load balancing, and scalability patterns.
CORS, JWT, OAuth, XSS, CSRF, and secure headers.