Core Logic
- Authentication – JWT vs. Session Cookies
- Caching Patterns – Cache-Aside vs. Write-Through
- Database Internals – B-Trees vs. LSM Trees
- Event-Driven Architecture (Kafka vs. SQS vs. RabbitMQ)
- The Real Cost of Serverless – When AWS Lambda Becomes More Expensive Than EC2
- SQL vs. NoSQL Decision Matrix
- Monolith vs. Microservices