Object-oriented design
Apply SOLID principles, design patterns like Singleton, Factory, and Observer, and build clean, maintainable Java architectures.
REST API development
Design and build production-ready RESTful APIs using Spring Boot with proper versioning, error handling, and documentation.
Microservices architecture
Break monoliths into microservices, implement Eureka discovery, API gateways, Feign clients, and resilience patterns.
Database integration
Map Java entities to relational databases using Hibernate and JPA. Handle transactions, relationships, and query optimization.
Security & authentication
Secure your APIs using Spring Security, JWT tokens, OAuth2, role-based access control, and industry best practices.
Testing & code quality
Write unit and integration tests with JUnit 5, mock services using Mockito, and practice test-driven development from day one.