Freelance Senior Java Backend Engineer | Java 21 | Spring Framework

IndiTech Consulting · Remote, India

Job Title: Senior Java Backend Engineer

Job Type: Part-Time | Freelance

Location: Remote

Experience: 5+ Years

About the Role

We are looking for a Senior Java Backend Engineer with strong hands-on experience in modern Java backend development, REST APIs, database integration, and enterprise system integrations.

The ideal candidate should be comfortable working with Java 21, Spring Framework 6, Jersey/JAX-RS, Jakarta EE, Couchbase , and both REST and SOAP-based integrations .

This is a part-time remote opportunity suitable for an engineer who can independently develop, troubleshoot, test, and maintain production-grade backend services.

️ Key Responsibilities

• Develop and maintain backend services using Java 21 and Spring Framework 6 .
• Build REST APIs using Jersey/JAX-RS and Jakarta EE/Servlet APIs.
• Work with Couchbase for data persistence and database operations.
• Implement JSON serialization/deserialization using Jackson .
• Develop and maintain SOAP integrations using Apache CXF, WSDL, JAXB, and SOAP.
• Integrate with downstream services such as EOS, SmartSwipe, and Communications Preference services using REST clients.
• Develop scalable and maintainable Maven multi-module applications.
• Implement application logging and distributed tracing using Log4j 2 and OpenTelemetry .
• Write and maintain unit/integration tests using JUnit 4, PowerMock, and EasyMock .
• Maintain code quality using JaCoCo, SonarQube, PMD, and Checkstyle .
• Deploy Java applications as WAR files to Tomcat/application servers.
• Work with Jenkins for CI/CD automation.
• Support containerized deployments using Docker/Kubernetes and Helm .
• Troubleshoot production issues and contribute to performance, reliability, and code-quality improvements.

Required Skills

• Strong hands-on experience with Java 21
• Spring Framework 6
• Jersey / JAX-RS
• Jakarta EE / Servlet APIs
• Couchbase
• Maven / Multi-module Maven projects
• Jackson
• REST API development and REST client integrations
• Apache CXF / SOAP / WSDL / JAXB
• JUnit 4 / PowerMock / EasyMock
• Jenkins CI/CD
• Kubernetes / Helm
• Tomcat / Application Server deployment
• Log4j 2 and OpenTelemetry
• SonarQube, JaCoCo, PMD, Checkstyle

⭐ Good to Have

• Experience working with enterprise-scale Java applications
• Experience integrating multiple downstream services
• Experience troubleshooting distributed systems
• Experience with cloud/containerized deployments
• Strong understanding of API design, testing, observability, and production support