> Markdown version of [/jobs/ext/3991275-java-developer-with-mainframe-exp](https://www.wearedevelopers.com/jobs/ext/3991275-java-developer-with-mainframe-exp). Every page supports `.md` or `Accept: text/markdown`. Links point to the HTML versions so they work for humans too. Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md).

---

# Java Developer with Mainframe Exp

- **Company:** Government Systems Technologies Inc. (GSTi)
- **Location:** Jersey City, NJ, United States
- **Contract:** Contract
- **Skills:** Java (Programming Language), Agile Methodology, Amazon Web Services, Application Integration Architecture, Application Performance Management, Unit Testing, Microsoft Azure, Customer Information Control System (CICS), Cloud Computing, COBOL (Programming Language), Code Review, Continuous Integration, IBM DB2, Relational Databases, Software Debugging, Java Platform Enterprise Edition (J2EE), Job Control Language (JCL), IBM Mainframe, Java Web Services, Mainframes, Apache Maven, Object-Oriented Software Development, SQL Databases, Virtual Storage Access Methods, Z/OS, Data Processing, Java Application Server, Enterprise Software Applications, Spring-boot, Backend, Git, Integration Tests, Software Coding, Restful APIs, Jenkins, Microservices
- **Published:** October 28, 2026
- **Apply:** https://www.dice.com/job-detail/dd52422c-ca64-4236-ac83-e1faeb87c68a

## About the Role

We are looking for an experienced Java Developer with Mainframe experience to design, develop, enhance, and maintain enterprise applications. The ideal candidate should have strong hands-on experience in Java development, backend technologies, and integration with legacy mainframe systems., * Strong experience in Core Java, J2EE, and object-oriented programming.

 * Hands-on experience with Spring Boot, REST APIs, and Microservices.
 * Experience working with mainframe technologies such as COBOL, JCL, DB2, CICS, or VSAM.
 * Knowledge of Java-to-mainframe integration and legacy application support.
 * Experience with SQL and relational databases.
 * Familiarity with Git, Maven, Jenkins, and CI/CD pipelines.
 * Strong debugging, problem-solving, and communication skills.
 * Experience working in Agile/Scrum environments.

Preferred Qualifications:

 * Experience in mainframe modernization or migration to Java-based applications.
 * Exposure to IBM z/OS and mainframe batch processing.
 * Experience with banking, financial services, or other enterprise applications.
 * Familiarity with cloud platforms such as AWS or Azure.

## Description

* Design, develop, test, and maintain Java-based enterprise applications.
 * Develop backend services and REST APIs using Java, Spring Boot, and Microservices.
 * Work on mainframe systems, including application integration, data processing, and legacy system modernization.
 * Integrate Java applications with mainframe technologies such as COBOL, JCL, DB2, CICS, and VSAM.
 * Analyze existing mainframe applications and support migration or modernization initiatives.
 * Troubleshoot production issues, perform root cause analysis, and implement solutions.
 * Collaborate with architects, business analysts, QA teams, and other developers.
 * Participate in code reviews, unit testing, integration testing, and deployment activities.
 * Work with relational databases and optimize SQL queries for application performance.
 * Follow coding standards, security practices, and Agile development methodologies.