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 contemporary 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

📌 Freelance Senior Java Backend Engineer | Java 21 | Spring Framework (Mumbai)
🏢 IndiTech Consulting
📍 Mumbai