Design, develop, and maintain enterprise-grade backend applications using Java 8/11/17/21+ Build scalable microservices using Spring Boot, Spring Cloud, Spring MVC Develop robust RESTful APIs and GraphQL APIs following industry best practices Design and implement microservices architecture with proper service decomposition, API Gateway, Service Registry, Circuit Breaker patterns Implement Spring Cloud components — Eureka, Zuul/Spring Cloud Gateway, Config Server, Ribbon, Hystrix/Resilience4j, Sleuth, Zipkin Write clean, modular, and well-documented code following SOLID principles, Design Patterns, and Clean Code practices Implement event-driven architecture using Apache Kafka, RabbitMQ, ActiveMQ,



AWS SQS/SNS Design and optimize database schemas for both SQL (PostgreSQL, MySQL, Oracle, SQL Server) and NoSQL (MongoDB, Cassandra, DynamoDB, Redis) databases Implement ORM using Hibernate, JPA (Java Persistence API), Spring Data JPA, MyBatis Build and maintain batch processing jobs using Spring Batch Implement caching strategies using Redis, Ehcache, Hazelcast, Caffeine Cache for performance optimization Design and implement authentication & authorization — Spring Security, JWT, OAuth 2.0, SSO, LDAP, Keycloak, SAML, Role-Based Access Control (RBAC)

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