Java Backend Developer (AI Claude)

Contract to Hire Miami, FL Job Description Summary: Hands-on Java microservices engineer coding day-to-day on a cloud-native commerce platform. You will build and maintain REST APIs, GraphQL subgraphs, composite services, and integration gateways deployed on Kubernetes in AWS.

Responsibilities

• Design, develop, and maintain Spring Boot microservices (both Spring MVC and Spring WebFlux/reactive)
• Build and extend federated GraphQL subgraphs using Spring GraphQL
• Develop composite services that orchestrate calls across cart, pricing, inventory, eligibility, and order domains
• Implement resilient HTTP integrations using WebClient and RestTemplate with Resilience4j circuit breakers
• Build Kafka consumers/producers with schema registry and Avro serialization

Configure and optimize Redis caching with Sentinel replication

• Implement OAuth2 client credential flows for upstream API integration
• Write comprehensive tests using JUnit 5, Mockito, WireMock, Rest Assured, and Reactor Test
• Maintain code quality with Checkstyle, PMD, SpotBugs, and JaCoCo coverage thresholds
• Leverage AI-powered development tools as part of daily workflow

Required Skills & Experience

• 5+ years hands-on Java development (Java 17+)
• Spring Boot 3.x — strong hands-on experience
• Spring MVC and Spring WebFlux (Project Reactor, reactive streams)
• GraphQL — Spring GraphQL, federated subgraph development, schema-first design
• Maven build system
• Kafka — producers/consumers, Avro serialization, schema registry
• Redis — caching strategies, Spring Data Redis, Sentinel
• Resilience4j — circuit breakers, time limiters, retry patterns
• WebClient and RestTemplate for downstream service calls
• OAuth2 client credential flows
• Kubernetes — pods, services, ConfigMaps, deployments
• Docker — containerized Java applications
• AWS — ElastiCache, cloud-native deployment patterns
• MapStruct for DTO mapping, Lombok
• JUnit 5, Mockito, WireMock, Rest Assured
• Code quality: Checkstyle, PMD, SpotBugs, JaCoCo (80%+ coverage targets)
• Git, GitHub Actions CI/CD
• Active usage of AI development tools in daily workflow

Nice To Have

• GraphQL federation and graph registry experience
• API gateway configuration (Apigee or similar)
• Service mesh experience (Istio)
• K6 or similar load testing frameworks
• Prometheus metrics and Spring Boot Actuator
• GraphQL code generation tooling
• Travel/e-commerce domain experience