Core Java

• Strong expertise in Core Java, OOP, Collections, Generics, Streams, and Exception Handling.
• Advanced knowledge of multithreading, concurrency, JVM internals, memory management, and garbage collection.
• Strong understanding of design patterns, SOLID principles, and clean code practices.

Backend Frameworks

• Extensive experience with Spring Boot, Spring MVC, Spring Data JPA, and Hibernate.
• Strong knowledge of Spring Security and Spring Cloud.
• Experience building REST APIs and microservices.

Microservices and Distributed Systems

• Experience designing scalable distributed applications.
• Strong knowledge of Kafka or RabbitMQ.
• Experience with service discovery, API gateways, distributed transactions, idempotency, and resiliency patterns.

Database and Caching

• Strong SQL skills and experience with PostgreSQL, Oracle, or MySQL.
• Experience with query optimization, indexing, execution plans, and database transactions.
• Knowledge of Redis, MongoDB, and caching strategies.

Cloud and DevOps

• Experience with AWS, Azure, or Google Cloud Platform.
• Hands-on knowledge of Docker and Kubernetes.
• Experience with CI/CD, Jenkins, Git, Maven or Gradle, and automated deployments.
• Familiarity with infrastructure monitoring, centralized logging, and distributed tracing.

Testing and Quality

• JUnit 5, Mockito, integration testing, and API testing.
• Experience with SonarQube, static code analysis, and code quality standards.