Ensuring transactions are reliable and secure.

Protecting sensitive data at rest and in transit. 5. Caching and Performance Optimization

Every official site had it behind a three-hundred-dollar paywall. But Silas, a self-taught coder living off ramen and freelance bug bounties, couldn't afford the entry fee to the high-stakes world of distributed systems. He needed to understand horizontal scaling and database sharding, or his career was dead on arrival. "Found you," he whispered.